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Marathon's deadly moments captured from office building above finish line

An amateur photographer who works in a downtown Boston office captured grim photos of the moment when the bombs went off as the marathon was finishing on Monday.

"I went to the window and I was looking in the direction of the finish line. I saw simultaneously a runner go down, a huge explosion, and then a deafening roar," Benjamin Thorndike said. "I had my camera in my hand, and I just pushed the rapid-shutter button down and just took 25 pictures over the course of what felt like a long time, but I think it was only 15 or 20 seconds."

None of the people in Thorndike's photos have been identified.

Courtesy Ben Thorndike

Courtesy Ben Thorndike

Courtesy Ben Thorndike

Courtesy Ben Thorndike

Courtesy Ben Thorndike

Courtesy Ben Thorndike

Courtesy Ben Thorndike

Courtesy Ben Thorndike

Hear Thorndike describe the experience in his own words, and watch the pictures in a video sequence, here.

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