Eleven minutes before the two explosions on April 15 at the Boston Marathon, surveillance video from a security camera at a nearby restaurant first picked up Dzhokhar and Tamerlan Tsarnaev, who became suspects in the attack. Tamerlan died as a result of injuries sustained in a subsequent confrontation with police. Dzhokhar, his younger brother, was charged Monday with use of a weapon of mass destruction and destruction of property resulting in death.
Here is a breakdown of those 11 minutes, based on an affidavit filed with the criminal complaint. The times are approximations, compiled by the FBI from video and photographic evidence.
About 30 seconds before the first explosion, Dzhokhar put the phone to his ear for about 18 seconds.
Ten seconds later, the second bomb explodes at 755 Boylston St., where Dzhokhar left the backpack.