Incident Summary:

04/18/2013: A Massachusetts Institute of Technology (MIT) police officer, Sean Collier, was shot and killed by gunmen on the MIT campus in Cambridge, Massachusetts, United States. The suspected assailants of the attack were later identified as Tamerlan and Dzhokhar Tsarnaev, who are believed to also be responsible for the double bomb attack near the finish line of the Boston Marathon that took place on April 15, 2013. Shortly after the killing of Collier, the suspects were involved in a shootout with police as they attempted to flee the Boston area. Tamerlan Tsarnaev was killed in the firefight. Dzhokhar Tsarnaev was arrested later that evening after he was discovered hiding in a boat that was parked in a Watertown, Massachusetts resident's backyard. Tsarnaev had written a claim of responsibility on the side of the boat. On July 10, 2013, Dzhokhar Tsarnaev pleaded not guilty to 30 federal counts related to the killing of Collier and the marathon attacks.



United States

North America

region/u.s. state:



Attack Information
Type of Attack (more) Armed Assault
Successful Attack? (more) Yes
Target Information (more)
Target Type: Educational Institution
Name of Entity Massachusetts Institute of Technology (MIT)
Specific Description Security Officer: Sean Collier
Nationality of Target United States
Additional Information
Hostages No
Ransom No
Property Damage No
Weapon Information
Type Sub-type
Firearms Unknown Gun Type
Additional Information
Suicide Attack?No
Part of Multiple Incident?No
Criterion 1 (more) Yes
Criterion 2 (more) Yes
Criterion 3 (more) Yes
Doubt Terrorism Proper (more) No
Perpetrator Group Information
Group Name Claimed Responsibility
Muslim extremists Yes (Confirmed: Unknown; Mode: Personal claim)
Perpetrator Statistics
Number of Perpetrators 2
Number of Captured Perpetrators 1
Casualty Information
Total Number of Casualties 1 Fatalities / 0 Injured
Total Number of Fatalities 1
Number of U.S. Fatalities 1
Number of Perpetrator Fatalities 0
Total Number of Injured 0
Number of U.S. Injured 0
Number of Perpetrators Injured 0
"Boston Marathon Terror Attack Fast Facts," CNN Wire, July 11, 2013.
"Timeline: The Boston Marathon bombing, manhunt and investigation," CNN Wire, May 2, 2013.
"What Boston Marathon Bombing Suspect Dzhokhar Tsarnaev Wrote in Blood-Stained Boat," ABC News, March 10, 2015.