Criminal complaint - United States vs. Dzhokhar Tsarnaev

The Justice Department, in a criminal complaint unsealed Monday, charged Dzhokhar Tsarnaev with using a "weapon of mass destruction" in the Boston Marathon bombings. It said he used his cellphone as he waited for the first blast, allegedly detonated by his older brother a block up the street, then "calmly but rapidly" walked away, leaving a backpack containing the second bomb on the ground near a metal barrier in front of the Forum Restaurant, where it exploded about 10 seconds later. According to the FBI, one of the brothers later told the driver of a vehicle they carjacked, “Did you hear about the Boston explosion? I did that." Dzhokhar Tsarnaev charged with using ‘weapon of mass destruction’