Surveillance video from the Boston Marathon attack shows one suspect dropping his backpack and calmly walking away from it before the bomb inside it exploded, Massachusetts Governor Deval Patrick said Sunday.

The video clearly puts 19-year-old Dzhokhar Tsarnaev at the scene of the attack, Patrick said on NBC.

‘It does seem to be pretty clear that this suspect took the backpack off, put it down, did not react when the first explosion went off and then moved away from the backpack in time for the second explosion,” Patrick said.

‘It’s pretty clear about his involvement and pretty chilling, frankly.’

He added, however, that he hasn’t viewed all the tapes but had been briefed by law enforcement about them.

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