Fifteen years ago, Timothy McVeigh parked a Ryder truck full of explosives next to the federal building in Oklahoma City and detonated it. One hundred sixty-eight people died and scores more were injured. At the time, it was the worst terrorist attack on U.S. soil.
Some of the people involved in the rescue and recovery recorded their remembrances of what happened.
Listen to the story on NPR http://n.pr/1fbD5ar