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A Pentagon police officer was fatally attacked Tuesday morning on a Metro bus platform, according to multiple sources. The suspect was also reportedly killed.

Pentagon Force Protection Agency Chief Woodrow Kusse said gunfire was exchanged during the encounter that began just before 10:40 a.m. and that there were several casualties, the Washington Post reports.

Kusse declined to say whether the officer or anyone else was killed in the incident and provided few details. But Sen. Mark R. Warner (D-Va.) tweeted out his condolences on the “passing of a Pentagon police officer, who was killed earlier this morning in a senseless act of violence outside the Pentagon.”

The fallen officer has not been identified.

The Associated Press reports the officer was stabbed.

AP also reported that the suspect was killed.

Kusse said the motive for the attack remains under investigation, but authorities were not searching for any additional suspects. The FBI is handling the probe of what happened.

The incident occurred at the Pentagon Transit Center, on the east side of the Pentagon, which is the largest transit hub in Northern Virginia, according to the Defense Department. With a rail station and numerous bus routes, it’s a key stop in the Washington region for commuters headed to and from the Virginia suburbs. The transit center has 13 bus bays on the upper level and 11 on the lower level, serving Metrobus, Fairfax Connector, Alexandria’s DASH, OmniRide, Arlington Transit and Loudoun County Transit buses.