Five people working on Independence Day fireworks shows were killed by explosions, four of them by a single blast that rocked Ocracoke, N.C., a remote village on the Outer Banks.

The fifth died after an explosion at a fireworks show in Pennsylvania, police said.

In another holiday accident, a pedestrian bridge collapsed in Indiana as fans were leaving a fireworks show, injuring 25 people. Authorities said Sunday the crowd had overloaded the bridge.

The blast at Ocracoke came as workers were unloading fireworks Saturday from a truck at the Anchorage Marina, shaking homes and businesses across the southern end of Ocracoke Island and rattling residents and tourists.

Earl Woodham, a spokesman for the Bureau of Alcohol, Tobacco, Firearms and Explosives, said agents determined the cause was accidental.