Richmond, Indiana explosion

The Richmond, Indiana explosion was a double explosion which occurred at 1:47 PM EST on Saturday, April 6, 1968 in downtown Richmond, Indiana. The explosions killed 41 people and injured more than 150. The primary explosion was due to natural gas leaking from one or more faulty transmission lines under the Marting Arms sporting goods store, located at the intersection of 6th and Main streets. A secondary explosion was caused by gunpowder stored inside the building.

• http://en.wikipedia.org/wiki/Richmond, Indiana explosion