Boston Marathon Race Bombing (15th April 2013)
From Wikipedia (27/5/2013)

During the Boston Marathon on April 15, 2013, two pressure cooker bombs exploded at 2:49 p.m. [Eastern Time Zone], killing 3 people and injuring 264. The bombs exploded about 13 seconds and 210 yards 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 surveillance video of two suspects. The suspects were identified later that day as the [Muslim] brothers Dzhokhar and Tamerlan Tsarnaev.

Shortly after the FBI released the images, the suspects allegedly killed an Massachusetts Institute Of Technology police officer, carjacked an SUV, and initiated an exchange of gunfire with the police in Watertown, Massachusetts. During the exchange, an Massachusetts Bay Transportion Authority police officer was critically injured, Tamerlan Tsarnaev was killed, and Dzhokhar Tsarnaev was injured and escaped. An unprecedented manhunt ensued on April 19, with thousands of police searching a 20-block area of Watertown.

During the manhunt, the authorities asked residents of Watertown and surrounding areas, including Boston, to stay indoors, and the public transportation system and most businesses and public institutions were shut down, resulting in a deserted urban environment of historic size and duration. Around 7 p.m., shortly after the "shelter-in-place" advisory was rescinded, a Watertown resident discovered the suspect hiding in a boat in his back yard. Dzhokhar was arrested and taken to a hospital