How did runners still on the Boston Marathon course experience the immediate aftermath of the bombings? The video below documents one runner's experience of learning en route that the bombings meant she wouldn't be finishing her marathon.

Katie Eastman, a Boston Herald reporter, ran Boston as a charity runner and documented her run with an on-the-go video camera. Her chronicle of the day includes the expected scenes of getting to Hopkinton, crossing the start line, running past the Wellesley College scream tunnel, and so on.

But then, after Eastman had covered 23 miles, surreal confusion set in, as she and other runners began to hear reports of explosions at the finish line. By the time she reached the 25-mile mark, vehicles were racing past, and she was diverted from the course.

As it turned out, Eastman lost her camera for the next three weeks. She set it down while changing into dry clothes once she'd stopped running, and forgot about it. A man who had been on the course to cheer his wife found the camera, used the footage he found on it to identify Eastman, and contacted Eastman to let her know he had her camera.

Scott Douglas Scott is a veteran running, fitness, and health journalist who has held senior editorial positions at Runner’s World and Running Times.

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