Update: Boston Marathon bombers brothers

The Boston Marathon bomber suspects have been identified as brothers coming from the Russian region near Chechnya, which has been plagued by an Islamic insurgency stemming from separatist wars. Their uncle claims the two have been living here for about a decade, and they traveled to the U.S. from the Russian region of Chechnya. A law enforcement intelligence bulletin obtained by the AP identified the surviving suspect as Dzhokhar A. Tsarnaev, 19, of Cambridge, Mass.

Today's events started overnight, after the suspects reportedly robbed a 7-Eleven robbing the store. They reportedly then were confronted by an M-I-T campus officer who was shot and killed in his car. The pair allegedly then stole a Mercedes SUV, leading police on a chase which included an exchange of gunfire with the suspects reportedly throwing explosive devices at pursuing officers. There was a shootout and one of the suspects was shot and killed. He has been tentatively identified as Tamerian Tsarnaev. The second suspect, Dzhokhar, fled the scene and is believed to be somewhere in the Watertown area which remains on lockdown at this time.

The suspects' clashes with police began only a few hours after the FBI released photos and videos of the two young men, who were seen carrying backpacks as they mingled among revelers at Monday's Boston Marathon. The bombings on Monday killed three people and wounded more than 180 others, and authorities revealed the images to enlist the public's help finding the suspects.