A man was shot and critically wounded Friday morning at the Southwest Washington waterfront, two blocks from Nationals Park.

D.C. police said the shooting occurred a few minutes after 9 a.m. in the 1400 block of First Street SW, in the Greenleaf public housing complex. It is two blocks from the First District police station and the offices of the homicide unit.

Few details were immediately available. Police described the victim as an adult male and said he was unconscious at the scene.

It was the second shooting in the District in a matter of hours.

Police said that shortly after 4 a.m., gunshots were fired at a car at Georgia Avenue and Euclid Street Northwest, adjacent to Howard University.

D.C. police said the victim drove to 7th and S streets NW, to the Shaw-Howard University Metro station, where officers found him with a gunshot wound to the arm. Police had initially said that the shooting had occurred near the station, but later updated the account.

On an Internet community bulletin board, police said officers stopped three people in the 200 block of V Street NW and arrested them in connection with the shooting. Their names have not been released pending filing of charges.

The shooting victim was found in the same block where Matthew Shlonsky, a 23-year-old recent graduate of American University, was struck by a stray bullet and killed in August when he emerged from a taxi and stepped into a gun battle at the corner.

Police have made one arrest in that case and attributed the motive to a dispute between young men that followed a series of shootings in a nearby Shaw public housing complex.