Video shows grenade barrage that shocked Dzhokhar Tsarnaev into submission

Previously unseen video of the dramatic capture of Boston Marathon bomber Dzhokhar Tsarnaev shows a police robot ripping apart the tarp concealing the suspect and numerous flash bang grenades being thrown into the boat where he lay.

In the final moments before his capture on Friday night, Dzhokhar Tsranaev appeared to lay still inside David Henneberry’s boat in a backyard in Watertown, Massachusetts, before he was taken into custody.

Dzhokhar Tsarnaev, 19, has been hospitalized in serious but stable condition after his arrest and officials say he cannot speak to investigators yet because he has been “intubated and sedated” with a throat wound.