Boston Marathon bombings 4 killed 280 injured April 15, 2013

The Boston Marathon bombings and subsequent, related shootings were a series of attacks and incidents which began on April 15, 2013, when two pressure cooker bombs exploded during the Boston Marathon at 2:49 pm EDT, killing 3 people and injuring an estimated 264 others. The bombs exploded about 12 seconds and 210 yards (190 m) apart, near the finish line on Boylston Street.
The Federal Bureau of Investigation (FBI) took over the investigation and, on April 18, released photographs and a surveillance video of two suspects. The suspects were identified later that day as Chechen brothers Dzhokhar Tsarnaev and Tamerlan Tsarnaev. Shortly after the FBI released the images, the suspects killed an MIT policeman, carjacked an SUV, and initiated an exchange of gunfire with the police in Watertown, Massachusetts. During the firefight, an MBTA police officer was injured but survived with severe blood loss. Tamerlan Tsarnaev was shot several times in the firefight and his brother subsequently ran him over with the stolen SUV in his escape. Tamerlan was pronounced dead at the scene.