Two bombs struck near the finish line of the Boston Marathon on April 15, 2013, killing three people and injuring more than 250 others. A fourth person, an MIT police officer, was killed three days later during the manhunt for the bombing suspects.
She knew something awful had happened. It was smoky and all she could hear were muffled screams. Her foot was turned sideways and her legs wouldn't work right. And her good friend, Krystle Campbell, was just lying there on the ground.