Law enforcement officials say they've got one person in custody and are investigating whether a second was involved in a shooting at the Pentagon subway entrance.

The officials spoke on condition of anonymity because the investigation is still unfolding.

They say there's no immediate signs of terrorism but, with information coming in quickly, they haven't ruled anything out.

Two police officers were shot and sustained grazing wounds. The suspect was also shot. His injuries were described as "pretty critical."

Three law enforcement officials, speaking on condition of anonymity because they were not authorized to discuss the investigation, said authorities were also scrutinizing a second man who may have accompanied the shooting suspect.

Two of the officials said investigators had not yet determined whether that second man had any involvement in the attack.

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Associated Press writer Eileen Sullivan contributed to this report.