A student shot and critically wounded two fellow students at a Maryland high school before exchanging fire with a campus security officer, who ended the attack by wounding the shooter, the county sheriff says.

A gunman opens fire at a Maryland office park, killing three co-workers and wounding two others, authorities and the business owner say.

A huge blizzard bearing down on the US east coast is expected to dump near-record levels of snow on Washington and the Mid-Atlantic region.

Aides to Hillary Rodham Clinton at the State Department complain about the limitations of using email to discuss sensitive diplomatic information.

One man is dead and another severely injured after a shootout at one of the main gates of the National Security Agency located at Fort Meade, Maryland.