Did younger 'bomber' KILL his own brother by running him over?

Watertown Police Chief Deveau said Tamerlan Tsranaev, 26, marched towards police officers while shooting at them
'He all of a sudden comes out from under cover and just starts walking down the street, shooting at our police officers, trying to get closer,' Deveau said

Suspect eventually ran out of ammunition and was tackled to the ground

His brother jumped behind the wheel of carjacked SUV and ran Tamerlan over, dragging his body a short distance.
Over 200 rounds were fired in the span of 5-10 minutes. Police say suspects lobbed five crude bombs at them, at least one of them a pressure cooker explosive

Daily Mail Source

"We're trying to get him handcuffed. There's two or three police officers handcuffing him in the street -- the older brother. At the same time, at the last minute -- they obviously have tunnel vision, it's a very, very stressful situation -- one of them yells out, 'Look out!' and here comes the black SUV, the carjacked car, directly at them. They dive out of the way, and he (the younger brother) drives over his brother and drags him a short distance down the street."

CNN Source

(I didnt think yall would accept the source from "The Blaze").

Idk ive heard too much speculation on this story already.