04/15/2013 06:11 EDT | Updated 06/15/2013 05:12 EDT

Boston Marathon Bombings: Nuclear Plants Tighten Security In New Hampshire, Massachusetts

WASHINGTON - Nuclear power plants in Massachusetts and New Hampshire have increased security after two bombs exploded in Boston on Monday, killing at least two people and injuring dozens. The Pilgrim Nuclear Power Station in Plymouth, Mass., and the Seabrook Station in Seabrook, N.H., heightened checks of vehicles, materials and individuals entering the plants.

Pilgrim, about 45 miles south of Boston, was already shut down for refuelling when the explosions occurred. Seabrook is about 45 miles north of Boston in Seabrook, N.H.

Eliot Brenner, a spokesman for the Nuclear Regulatory Commission, said federal officials have not ordered changes in security at other U.S. nuclear reactors in the wake of the Boston explosions.

WARNING: Some of the photos and videos from the scene may be graphic and disturbing.

Photo gallery GRAPHIC WARNING: Boston Marathon explosion See Gallery