Crim­i­nol­o­gist James Alan Fox says the uncle’s intu­ition is jus­ti­fied. In cases like this, he says, it is highly unusual for the younger par­tic­i­pant — in this case, a sib­ling — to be the leader.

I would be sur­prised,” says Fox, a pro­fessor of Crim­i­nology, Law and Public Policy at Boston’s North­eastern Uni­ver­sity. “Very surprised.”

What­ever their fra­ternal pecking order, when the bul­lets began flying in Water­town on Thursday night and 26-​​year-​​old Tamerlan went down, his younger brother ran him over — drag­ging him for about 30 feet — before ditching the car and fleeing on foot. After a 24-​​hour man­hunt that shut down most of the Boston met­ro­pol­itan area, police cor­nered the gravely wounded Dzhokhar hiding in a boat in a back­yard, only blocks from where his brother bled out.

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