Jurors shown video of Boston Marathon bombing - Boston News, Weather, Sports | FOX 25 | MyFoxBoston

BOSTON (AP) -- Jurors in the trial of Boston Marathon bombing suspect Dzhokhar Tsarnaev have been shown a video of the first explosion.

The video shows a huge blast of smoke, then police officers running toward the blast. Runners looked over their shoulders and spectators turned their heads toward the sound of the bombing.

The jury watched the video intently, many looking somber.

Twenty-nine-year-old Krystal Campbell was killed by the first bomb. She was among the three killed and 260 injured after twin bombs exploded near the marathon finish line.