Panicked passengers have fled Washington DC's main train station after a security officer shot a man who had stabbed a woman, in what police said appeared to be a domestic incident.
Friday's incident - which sparked a brief panic at Union Station - came on the 14th anniversary of the 9/11 attacks, when US authorities are on high alert, especially across the capital city.
Rail service at the station, a main Amtrak hub on the US East Coast rail line linking Boston, New York and Washington, resumed shortly after the incident.
Police commander Jeff Brown told reporters the suspect apparently stabbed the woman at the entrance to an adjacent building, and was then chased into the station by an armed security officer from the adjacent Securities and Exchange Commission.
The officer fired one round when the suspect refused to surrender his weapon and lunged toward him.
The suspect was hit in the side, and his injuries - along with those of the woman - were not life-threatening, he said.
Both were being treated at area hospitals.
"We believe this is a domestic-related incident," Brown said. "There is no active shooter, there was no active shooter. This was an isolated incident."