This is the chain of events as reported by NYC The Blog,
The gunshots sounded like they came south of 144th. After arriving on foot at the corner of 145th and St Nicholas, there were ambulances and police on the NE corner, as well as mid-way down St. Nicholas btw 144th and 145th.
I can not be sure, the vehicles were blocking the view, but it looked to me if they had picked someone off the sidewalk in front of Capital One Bank on the corner of 145th; they def put someone in the ambulance. Someone standing by who lives in the area said it looked like they pulled someone out of the ATM vestibule of the Capital One Bank. The police have the sidewalk taped off directly in front of the ATM vestiubule and could be seen canvassing the ground on the entrance way out front with a flashlight.
At the other scene down St Nicholas, someone was being loaded into an ambulance, while many residents of 660 St Nicholas stood outside.
That's the only information NYC The Blog has at this time.
UPDATE: A tipster informs us "We're hearing 3 people were shot, but none (at this time) are likely to die."
UPDATE: ABC 7 has more,
"The shooting happened outside the subway station at 145th Street and St. Nicholas Avenue shortly after 10:00 p.m. Police said two women and a man were wounded. All three were taken to Harlem Hospital. None of the injuries are life-threatening, officials said.
An off-duty police officer driving in the area saw the shooting. He watched the alleged gunman get into a livery cab and followed him, police said. The officer arrested the suspect at 132nd Street and Lenox Avenue."