Metro Transit Police are investigating a series of armed robberies that occurred over the last two weeks in the parking garage at Suitland station and say they have increased patrols.

In the incidents, a man with a black handgun approached riders, demanded valuables and fled on foot, Metro said.

No one was injured in the robberies, transit authorities said. The first one occurred Sept. 27 and the most recent was Thursday at 8:35 a.m. The other robberies occurred between 5:15 p.m. and 8:30 p.m.

Metro described the suspect as a 5-foot-6 African American male with a dark complexion and black dreadlocks. He was wearing a baseball cap during the robberies. Metro said he is estimated to be 20 to 25 years old.

Transit Police said they have increased patrols and are working with local police agencies. Prince George’s County police conduct additional patrols of parking lots, stations and bus stops at Suitland and other stations in the county, according to Metro.

Anyone who witnessed the incidents or has information is asked to call Metro Transit Police at 202-962-2121.