Pentagon Force Protection Agency Chief Woodrow Kusse said an officer was attacked at a transit station outside the Pentagon on Tuesday morning, gunfire was exchanged between the suspect and law enforcement and multiple people were injured.

The big picture: The headquarters of the U.S. military went under temporary lockdown after multiple shots were fired. The area reopened after being secured, though the station remains closed, according to the Pentagon Force Protection Agency.

What they're saying: Kusse at a press conference later on Tuesday said the officer was attacked at about 10:35 a.m. ET on a Metro bus platform.

• He added the FBI is leading an investigation into the attack and did not disclose the number of people injured.
• Kusse cited "several casualties" but did not confirm whether an officer died. 
• "The Pentagon and the Pentagon reservation are safe and secure," he said, noting there is no active search for a suspect.