One year ago, on April 15, 2013, two explosions went off near the finish line of the Boston Marathon. The deadly blasts, which took three lives and injured hundreds more, set into motion a days-long search for the perpetrators.
On April 18, the FBI released images of two suspects, brothers Tamerlan and Dzhokhar Tsarnaev. Soon thereafter, an MIT police officer was killed, a car was hijacked, and a shootout with law enforcement ensued. The older brother, Tamerlan Tsarnaev, was killed in the pursuit. Dzhokhar Tsarnaev was captured, injured but alive, in Watertown on April 19.
Here, a look back at the chaos as it unfolded over the course of those five days.
(Click each title to see video on mobile devices.)
Almost three hours after the first runners cross the finish line, two explosions ring out on Boylston Street. Authorities scramble to assess the situation.
FBI task force begins a forensic evidence recovery effort. Investigators find pieces of black nylon and fragments of BBs and nails.
Law enforcement releases video and pictures of the two suspects, Tamerlan Tsarnaev, 26, and Dzhokhar Tsarnaev, 19.
MIT police officer Sean Collier and bombing "suspect number one," Tamerlan Tsarnaev, ultimately die from their wounds. An active search for "suspect number two," Dzhokar Tsarnaev, continues.
Boston and surrounding areas are placed in lockdown as "suspect number two," Dzhokhar Tsarnaev, considered armed and dangerous, is on the loose. The stay indoors request is later lifted with a warning to residents to stay vigilant.
Manhunt for second suspected marathon bomber, Dzhokhar Tsarnaev, ends on a boat in the backyard of a Watertown resident.