This is the current information at this time:
The Associated Press identified the surviving Boston bomb suspect as Dzhokhar A. Tsarnaev, 19, of Cambridge, Mass., and said that the suspects were brothers. The second bombing suspect is Tamerlan Tsarnaev, 26, according to NBC News, who was found with an IED on his body. The brothers are of Chechen origin, according to NBC, a volatile southern Russian republic. Photographer Johannes Hirn took this photo essay of the older brother, a boxer. The captions suggest Tsarnaev came to America as a child with his family as refugees after fleeing Chechnya for Kazakhstan. Dhokhar Tsarnaev appeared to have posted links to Islamic and pro-Chechnyan independence sites on his social media page.
The mayhem began at approximately 10:20 p.m. Thursday when police said the bombing suspects robbed a 7-Eleven store in Cambridge. Minutes later, police said, the men shot and killed an MIT campus officer responding to the robbery call. The terror suspects then carjacked a Mercedes-Benz with the driver inside and fled, eventually letting driver go. They were then spotted in Watertown where they exchanged dozens of rounds of gunfire with patrol officers.Tamerlan Tsarnaev was shot by police and brought to Beth Israel Medical Center. He arrived at the hospital under cardiac arrest with multiple gunshot wounds and blast-like injuries to his chest. The second suspect fled on foot, leading to the tense manhunt that is still underway at this hour.
Law enforcement appears to have Dzhokar trapped in a standoff at this time.
After finding the additional IED, police are concerned about other bombs so the city of Boston is in lockdown.