The robbery happened on the 1000 block of the 12th Street SE about 2 a.m. The area is about a block from the Potomac Gardens public housing complex.
The victim was sitting in his car when a man came up to him and flashed a gun, according to authorities. The thief then ordered the victim to hand over his cellphone.
After the victim gave up his phone, the robber fled.
The suspect is described as a short-haired man who is about 20 years old.
Photo via Google Maps