A man was killed and a second injured by gunfire Monday after apparently trying to ram an entrance gate to the US National Security Agency outside Washington, media reports said Monday.

A man was killed and a second injured by gunfire Monday after apparently trying to ram an entrance gate to the US National Security Agency outside Washington, media reports said Monday.

Video imagery showed a crash-damaged police vehicle and a civilian vehicle outside a main gate of the super-secure Fort Meade, Maryland headquarters of the NSA, the U.S. intelligence agency that conducts electronic surveillance worldwide.

US television reports, citing a federal law enforcement official, said a police officer fired on the vehicle when it tried to ram the gates to the complex.

CNN reported that police in Anne Arundel, Maryland said one person was killed and another injured in the incident. Other media also reported the toll.

There was no immediate comment from the NSA or the Pentagon.