The Texas City disaster of 1947 was the deadliest industrial accident in U.S. history, killing 550-600 people when 2,300 tons of ammonium nitrate detonated on a ship in Texas City, Texas. The initial explosion was so powerful that it caused another ship carrying ammonium nitrate to explode 16 hours later. All firefighters and spectators on the pier were killed immediately, along with many workers in the surrounding area. School children over a mile away were injured by flying debris.