Overnight explosion traced to a firework set off in a locker; two arrested

To check this alert, Claude (an AI) read it in full 25 separate times, independently. Each read decided whether the message answers each of the six questions and gave a short reason. A final reviewer then weighed all 25 and wrote the plain-English verdict you see when you open a row. The score (for example 22/25) is how many reads agreed; the 25 individual reads are tucked underneath if you want to check them.

• Sourcepresent25/25

  Final assessment

  Unanimous: the Harvard University Police Department and Boston Fire and Police are named as authorities.

  Who is sending the alert and who is responding. People act faster on a message from a clearly identifiable, credible sender, such as a named department, the police, or a branded alert system, than on an anonymous notice. A branded signature counts.

  See all 25 individual reads

  1. present: Identifies "Harvard University Police Department," Boston Fire and Police as authorities.
  2. present: Names "Harvard University Police Department" and "Boston Fire Department" as the source.
  3. present: Names "a Harvard University Police Department officer" and "Boston Fire Department".
  4. present: Names a "Harvard University Police Department officer" and Boston Fire and Police, identifying the source.
  5. present: Names "Harvard University Police Department", "Boston Fire Department", and "Boston Police Department."
  6. present: "Harvard University Police Department" and "Boston Fire Department" name the authorities.
  7. present: Names "Harvard University Police Department" and Boston Fire and Police as sources.
  8. present: It names "a Harvard University Police Department officer" and Boston Fire and Police, the source.
  9. present: Names "Harvard University Police Department" and "Boston Fire Department" as authorities.
  10. present: Names "Harvard University Police Department" and Boston Fire/Police, responding authorities.
  11. present: Names the authorities, "Harvard University Police Department", "Boston Fire Department Arson Unit", and "Boston Police Department".
  12. present: Names "Harvard University Police Department" and Boston Fire and Police, the source.
  13. present: Names "a Harvard University Police Department officer" and the Boston Fire and Police Departments, identifying authorities.
  14. present: It names "a Harvard University Police Department officer" as the responding authority.
  15. present: Names "a Harvard University Police Department officer" and "Boston Fire Department", identifying authorities.
  16. present: Names "Harvard University Police Department" and "Boston Fire Department", authorities.
  17. present: Names "Harvard University Police Department" and "Boston Fire Department" as authorities.
  18. present: Names "a Harvard University Police Department officer", the responding authority.
  19. present: Names "a Harvard University Police Department officer" and "Boston Fire Department".
  20. present: Names "a Harvard University Police Department officer", "Boston Fire Department", and "Boston Police", identifying authorities.
  21. present: It names a "Harvard University Police Department officer" and "Boston Fire Department".
  22. present: Names a "Harvard University Police Department officer" and BPD and BFD as authorities.
  23. present: Names "Harvard University Police Department", "Boston Fire Department", and "Boston Police Department".
  24. present: Names "Harvard University Police Department" and "Boston Fire Department", the responders.
  25. present: Names "a Harvard University Police Department officer" and "Boston Fire Department Arson Unit".
• Hazardpresent25/25

  Final assessment

  All reads agree: the alert names a specific hazard, an explosion deemed intentional.

  What the threat actually is. A complete warning names the specific danger, such as a shooter, a fire, a tornado, or a gas leak, rather than a vague emergency, because people decide what to do based on what they are facing.

  See all 25 individual reads

  1. present: States the hazard specifically: "an explosion had occurred" deemed intentional.
  2. present: Names the hazard, "an explosion" deemed "intentional".
  3. present: Names "an explosion" that "appeared to be intentional", a specific threat.
  4. present: Names a specific hazard, that "an explosion had occurred" deemed intentional.
  5. present: Names a specific threat: "an explosion had occurred" deemed intentional.
  6. present: It names that "an explosion had occurred", a specific hazard.
  7. present: Says "an explosion had occurred" judged intentional, a specific hazard.
  8. present: It names that "an explosion had occurred" and a fire alarm, a specific hazard.
  9. present: Names a specific hazard: "an explosion had occurred" deemed "intentional".
  10. present: Names that "an explosion had occurred", a specific threat.
  11. present: Names a specific hazard, "an explosion had occurred" that "appeared to be intentional".
  12. present: Names "an explosion" deemed intentional, a specific hazard.
  13. present: Names "an explosion" assessed as "intentional", a specific threat.
  14. present: It names a specific hazard, "an explosion had occurred" that "appeared to be intentional."
  15. present: Names that "an explosion had occurred", a specific hazard.
  16. present: Names a specific threat, "an explosion had occurred" appearing "intentional".
  17. present: Names "an explosion" deemed "intentional", a specific hazard.
  18. present: Names that "an explosion had occurred", a specific threat.
  19. present: Names "an explosion" that "appeared to be intentional", a specific hazard.
  20. present: Names a specific hazard, an "explosion" that "appeared to be intentional".
  21. present: It states "an explosion had occurred", a specific hazard.
  22. present: Names "an explosion" determined to be "intentional", a specific threat.
  23. present: Names a specific hazard: "an explosion had occurred" appearing "intentional".
  24. present: Names "an explosion" that "appeared to be intentional", a specific threat.
  25. present: Names a specific hazard, "an explosion" that "appeared to be intentional".
• Locationpresent25/25

  Final assessment

  Unanimous: a precise location is given, the Goldenson building at 220 Longwood Avenue, Boston.

  Where the threat is. Saying whether danger is in a specific building, a part of campus, or area-wide lets people judge their own proximity and choose a safe direction. Without a where, a warning is hard to act on precisely.

  See all 25 individual reads

  1. present: Gives location "the Goldenson building at 220 Longwood Avenue, Boston."
  2. present: Locates it at "the Goldenson building at 220 Longwood Avenue, Boston".
  3. present: Locates it at "the Goldenson building at 220 Longwood Avenue", a specific place.
  4. present: Gives the location, "the Goldenson building at 220 Longwood Avenue, Boston".
  5. present: States it is at "the Goldenson building at 220 Longwood Avenue, Boston."
  6. present: It locates it at "the Goldenson building at 220 Longwood Avenue, Boston", on the 4th floor.
  7. present: Locates it at "the Goldenson building at 220 Longwood Avenue, Boston".
  8. present: It locates it at "the Goldenson building at 220 Longwood Avenue, Boston", a specific place.
  9. present: Locates it at "the Goldenson building at 220 Longwood Avenue, Boston".
  10. present: Specifies "the Goldenson building at 220 Longwood Avenue, Boston".
  11. present: Specifies "the Goldenson building at 220 Longwood Avenue, Boston".
  12. present: Locates it "the Goldenson building at 220 Longwood Avenue, Boston".
  13. present: Says it occurred "to the Goldenson building at 220 Longwood Avenue", a specific location.
  14. present: It locates it "the Goldenson building at 220 Longwood Avenue, Boston."
  15. present: Locates it at "the Goldenson building at 220 Longwood Avenue", a specific place.
  16. present: Specifies "the Goldenson building at 220 Longwood Avenue, Boston".
  17. present: Specifies "the Goldenson building at 220 Longwood Avenue".
  18. present: Specifies "the Goldenson building at 220 Longwood Avenue", a location.
  19. present: Says "the Goldenson building at 220 Longwood Avenue, Boston", a specific address.
  20. present: States the location, "the Goldenson building at 220 Longwood Avenue, Boston".
  21. present: It locates it at "the Goldenson building at 220 Longwood Avenue, Boston".
  22. present: Says it occurred at "the Goldenson building at 220 Longwood Avenue, Boston", a specific address.
  23. present: Specifies "the Goldenson building at 220 Longwood Avenue, Boston".
  24. present: Says "the Goldenson building at 220 Longwood Avenue, Boston", a specific location.
  25. present: Locates it at "the Goldenson building at 220 Longwood Avenue, Boston".
• Guidanceabsent0/25

  Final assessment

  Unanimous: the message describes responder actions but directs no protective instruction to recipients.

  The protective action to take. A clear, specific instruction, such as shelter in place, evacuate, avoid the area, or run-hide-fight, drives faster and more correct protective behavior than describing the threat alone.

  See all 25 individual reads

  1. absent: Describes responders' actions but gives no instruction to recipients.
  2. absent: Describes responders investigating but gives no instruction to recipients.
  3. absent: Describes responder actions but gives recipients no protective instruction.
  4. absent: Describes responder actions but gives no protective action instruction to recipients.
  5. absent: Describes the response only; gives recipients no protective action instruction.
  6. absent: It narrates the response but gives no protective action to recipients.
  7. absent: Recounts responder actions but gives no protective instruction to recipients.
  8. absent: It is a factual after-incident account giving no protective instruction to recipients.
  9. absent: Reports the response but gives recipients no protective action.
  10. absent: Describes responders only, with no instruction to recipients.
  11. absent: No protective action is instructed to recipients, it describes the response and that no injuries occurred.
  12. absent: Describes the response but gives no instruction to recipients.
  13. absent: Describes responder actions but gives no protective instruction to recipients.
  14. absent: It describes the response but gives no protective action instruction to recipients.
  15. absent: Describes the response but gives no protective-action instruction to recipients.
  16. absent: Describes the response but gives no protective action to recipients.
  17. absent: Describes responder actions but directs no protective action to recipients.
  18. absent: No protective action is directed to the recipient.
  19. absent: Recounts the response but gives no protective action instruction to recipients.
  20. absent: No protective action is directed to recipients, the text is a narrative of what responders did.
  21. absent: It describes responder actions but gives recipients no protective action instruction.
  22. absent: Recounts the response narrative; gives no protective action instruction to recipients.
  23. absent: Describes responder actions but gives recipients no protective-action instruction.
  24. absent: Recounts the response but gives recipients no protective action instruction.
  25. absent: No protective action is instructed to recipients, only a narrative of the response.
• Timepresent25/25

  Final assessment

  All reads agree a specific time and date are stated, approximately 2:48 AM on November 1, 2025.

  When the message applies. A timestamp, the word now or immediately, or a phrase like until further notice tells the reader whether the danger is current and how quickly to act.

  See all 25 individual reads

  1. present: Conveys time "At approximately 2:48 AM on November 1, 2025."
  2. present: Gives a clock time and date, "At approximately 2:48 AM on November 1, 2025".
  3. present: Gives "approximately 2:48 AM on November 1, 2025", a specific date and time.
  4. present: States "At approximately 2:48 AM on November 1, 2025", a clock time and date.
  5. present: Gives date and time "At approximately 2:48 AM on November 1, 2025."
  6. present: It gives a clock time and date, "At approximately 2:48 AM on November 1, 2025".
  7. present: Says "At approximately 2:48 AM on November 1, 2025", a clock time and date.
  8. present: It gives "At approximately 2:48 AM on November 1, 2025", a clock time and date.
  9. present: States "At approximately 2:48 AM on November 1, 2025", a clock time and date.
  10. present: Gives time and date "At approximately 2:48 AM on November 1, 2025".
  11. present: States a clock time, "At approximately 2:48 AM on November 1, 2025".
  12. present: States "At approximately 2:48 AM on November 1, 2025", a clock time.
  13. present: States "At approximately 2:48 AM on November 1, 2025", a specific date and time.
  14. present: It gives a clock time and date, "At approximately 2:48 AM on November 1, 2025."
  15. present: States "At approximately 2:48 AM on November 1, 2025", conveying when.
  16. present: Gives "approximately 2:48 AM on November 1, 2025".
  17. present: Gives date and time, "At approximately 2:48 AM on November 1, 2025".
  18. present: Gives a clock time and date, "At approximately 2:48 AM on November 1, 2025".
  19. present: Gives a clock time and date, "At approximately 2:48 AM on November 1, 2025".
  20. present: Gives recency, "At approximately 2:48 AM on November 1, 2025", a clock time and date.
  21. present: It gives a clock time and date, "At approximately 2:48 AM on November 1, 2025".
  22. present: Gives the time "At approximately 2:48 AM on November 1, 2025".
  23. present: Gives the date and time "At approximately 2:48 AM on November 1, 2025".
  24. present: States "At approximately 2:48 AM on November 1, 2025", a clock time.
  25. present: Gives a clock time and date, "At approximately 2:48 AM on November 1, 2025".
• Impactpresent25/25

  Final assessment

  Present, unanimous. All 25 reads agree it reports an intentional explosion in a building, an explicit harmful event, while noting no injuries resulted.

  What the hazard could do to the people in its path. Beyond naming the threat, a complete warning conveys its potential consequences or severity, such as that a tornado can level buildings or that a leak could be explosive, so recipients grasp how much danger they are in. Research on warning message content finds that a concrete impact statement helps people personalize their risk and act sooner.

  See all 25 individual reads

  1. present: Reports an intentional explosion in a building, an explicit harmful event, while noting no injuries resulted.
  2. present: It reports an intentional explosion though it notes no injuries, conveying a serious harmful event.
  3. present: States that an intentional explosion occurred on the 4th floor though no injuries were reported, conveying a destructive event.
  4. present: States an intentional explosion occurred on the 4th floor, with the explicit note that no injuries were reported, conveying potential for harm.
  5. present: It reports an intentional explosion occurred on the 4th floor, which is a clearly stated destructive harmful event, even though no injuries resulted.
  6. present: Describes an intentional explosion on the 4th floor though it notes no injuries were reported, conveying a destructive hazard.
  7. present: Reports an intentional explosion occurred on the 4th floor, an explicit harmful event though no injuries resulted.
  8. present: Reports an apparent intentional explosion occurred though it notes no injuries, conveying a destructive event.
  9. present: Reports an intentional explosion on the 4th floor though it notes no injuries, conveying a serious harmful event.
  10. present: Reports an intentional explosion occurred on the 4th floor, a clearly stated destructive event, though it notes no injuries.
  11. present: Describes an intentional explosion that occurred on the 4th floor, a clearly stated harmful event, though it notes no injuries resulted.
  12. present: Reports an apparently intentional explosion though it notes no injuries, conveying a destructive hazardous event.
  13. present: Reports an intentional explosion occurred, conveying a serious destructive event though no injuries resulted.
  14. present: States an intentional explosion occurred and notes no injuries were reported, conveying the destructive nature of the event.
  15. present: Reports an intentional explosion occurred on the 4th floor, an explicit harmful event, though it notes no injuries.
  16. present: Reports an intentional explosion on the 4th floor though it notes no injuries, conveying an actual destructive event.
  17. present: It reports an intentional explosion occurred though it explicitly notes no injuries, conveying a destructive event.
  18. present: Reports an intentional explosion occurred, conveying a clear harm event, though it adds no injuries were reported.
  19. present: Reports an intentional explosion occurred on the 4th floor, an explicit harm even though no injuries resulted.
  20. present: Reports an intentional explosion occurred on the 4th floor, a clearly stated destructive event, though no injuries resulted.
  21. present: It describes an intentional explosion deemed by arson investigators, conveying a clear destructive harmful event though noting no injuries.
  22. present: States an intentional explosion occurred in the building though noting no injuries were reported, conveying a damaging consequence.
  23. present: States an intentional explosion occurred on the 4th floor, an explicit harmful event, though no injuries resulted.
  24. present: Describes an intentional explosion in a building, an inherently destructive event, though it notes no injuries were reported.
  25. present: States an intentional explosion occurred on the 4th floor, with the explosion itself being a clearly stated destructive harm even though no injuries resulted.