Massachusetts State Police Saturday released several thermal imaging photos that helped authorities confirm that the second Boston Marathon bombing suspect, Dzhokhar Tsarnaev, was hiding under a tarp in a boat behind a Watertown, Mass. resident’s house.

“Our helicopter had actually detected the subject in the boat,” said Col. Timothy Alben of the Massachusetts State Police, according to NBC News. “We have what’s called a FLIR — a forward-looking infrared device — on that helicopter. It picked up the heat signature of the individual, even though he was underneath what appeared to be the ‘shrink wrap’ or cover on the boat itself. There was movement from that point on. The helicopter was able to direct the tactical teams over to that area.”

Here are the photos:


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