Metro Transit Police are looking for this man and woman in connection with a shooting on an X2 bus on Monday. (Courtesy of WMATA)

Two men were shot on a Metrobus near Union Station late Monday night after an argument, a spokesman for Washington Metropolitan Area Transit Authority said.

About 45 passengers were on board the vehicle.

The wounded men, whose ages were not released, were transported to local hospitals with non-life-threatening injuries. One man was shot in the hand. The other was shot in the thigh.

Dan Stessel, chief spokesman for Metro, said the shooting occurred about 10:25 p.m. inside an X2 bus traveling east on H Street NW.

“There was an apparent verbal altercation that escalated into shots fired,” Stessel said.

Metro Transit Police are looking for this man and woman in connection with a shooting on an X2 bus on Monday. (Courtesy of WMATA)

The shooting suspect and the victims are all believed to have boarded the bus at 7th and H streets NW, Stessel said, about seven blocks from where the shooting happened. Police do not yet know whether the individuals knew each other.

“In that short time, as the bus made its way to this location at First and H streets NW, the altercation occurred and subsequently the shooting,” Stessel said, citing footage from video cameras on the bus as well as witness accounts. The suspect exited the bus through a rear door, then turned around and shot into the bus, he said.

“The cameras on the bus captured the shooting,” Stessel said. “The suspect, after the shooting, fled the scene in an unknown direction.”

Police issued an alert for a man, 5 feet and 10 inches tall, with a slim build and wearing a red jacket and hat. A hat and jacket matching the description were soon recovered near the area, however, so Stessel said the lookout for a person wearing those clothes “is no longer operative.”

On Tuesday, police said they were also looking for a woman who was traveling with the suspected shooter and walked away from the scene after the shooting. Police released photos of the man and woman, taken from video footage.

Shootings aboard Metro buses are rare, Stessel said. He stressed that there are cameras on all Metro buses, to deter crime and to help police solve crime when it occurs.

“It boggles the mind that anyone would commit such an act in a place where every inch on the bus is being recorded,” Stessel said. “There are cameras on the outside of the bus that captured the shooting.”

Metro Transit Police are looking for this man and woman in connection with a shooting on an X2 bus on Monday. (Courtesy of WMATA)

deneen.brown@washpost.com