D.C. Metro shooting suspect gets mental health evaluation after rampage

Police said three people were shot, including 64-year-old Robert Cunningham, a Metro mechanic who was killed trying to stop the gunman. The two other people were shot in the legs and wounded, and police said a fourth person hurt a hand while rushing away from the shooting.

The police spokesman, Dustin Sternbeck, said Trotman was taken for evaluation after his arrest. Police said a motive remains unclear, though the gunman seemed to target people at random.

Police said the attack started about 9:20 a.m. on a Metrobus traveling from Maryland and ended on the underground platform at the station in the 1400 block of Potomac Avenue in Southeast Washington.

Police said the gunman followed a passenger off the bus and shot the person in the legs. The gunman then went down the escalator and shot another person in the leg at a Metro fare card stand, police said.

Authorities said he then approached a woman on the platform, while holding a gun at his side. Cunningham tried to intervene, police said, and was fatally shot. A second transit worker tired to de-escalate the situation, and other riders on the platform tackled the gunman before police took him into custody, authorities said.

Police have described Cunningham as a hero.

This is a developing story and will be updated.