A gunman opened fire in several locations in a string of random shootings Wednesday, killing a DC Metro subway employee and injuring three others.

The DC Metro worker was fatally shot after trying to intervene when the gunman got into a confrontation with a woman on the subway platform at the Potomac Avenue station, according to police.

"His heroism has to be recognized here today," Ashan Benedict, the executive assistant chief of police for the Metropolitan Police Department, said at a press conference Wednesday morning.

Police said they believe the shooter may have been trying to rob the young woman.

Benedict said a second employee was able to deescalate the situation and stop the string of attacks. He was injured by shrapnel from the shooting of the other employee, police said.

The shootings began on a Metrobus, where the gunman allegedly shot someone in the leg. He then shot another person in the leg inside the nearby subway station. Both are being treated for non-life-threatening injuries, police said.

This is a developing story. Please check back for updates.