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This FBI Boston field office file records the line-of-duty death of MIT Police Officer Sean Collier during the events following the Boston Marathon bombing. It identifies Dzhokhar Tsarnaev and Tamerlan Tsarnaev as suspects in Collier's April 18, 2013 shooting outside MIT's Stata Center in Cambridge. The records also describe the subsequent carjacking, police pursuit, and Watertown shootout in which an MBTA police officer was wounded. The FBI opened a full investigation on April 21, 2013 and notes assistance by federal, state, and local police, including FBI victim-witness specialists assisting affected families.

FBI file number: 184A-BS-2823114 | Documents span: 2013 | Released in 2 parts
Names in this file: Sean Collier, Dzhokhar Tsarnaev, Tamerlan Tsarnaev, Richard Deslauriers, Jeffrey Ballet, John DiFava, Paul MacMillan
Subjects: Boston Marathon bombing aftermath, MIT Police, Sean Collier, Tamerlan Tsarnaev, line-of-duty death, Watertown shootout