Search on for gunman after 4 wounded in shooting in East Harlem

NEW YORK (WABC) -- Police are searching for a gunman after a shooting in East Harlem Wednesday afternoon left four people wounded, one critically.

The shooting happened at Madison Avenue and 132nd Street. The victims, three men and one woman, were taken to Harlem Hospital.

A 25-year-old man was shot in the head and a 17-year-old man was shot in the chest, while a 43-year-old man and a woman in her 20's were grazed.

One of the victims is in critical condition.

Sources say the shooting began at the Lincoln Houses, a city run housing complex and spilled over to a deli across the street.

One of the victims was shot inside the deli.

The 17-year-old was shot in the courtyard of the Lincoln Houses. One witness heard shots, ran to the complex and found a man lying on the sidewalk bleeding from the chest.

He called 911, was told how to render aid, took off the man's shirt and applied chest compressions.

"I was talking to him, I did talk to him, I was like 'get up, stay focused, just try to stay up,'" said another witness, Awilda Ortiz. "And then I was trying to ask his name but his eyes kept going back."

No weapon was recovered but numerous shell casings were found at the scene.

There have been no arrests, but the shooting was caught on surveillance video and police are reviewing footage.