BALDWIN PARK — Police cordoned off a neighborhood as they searched for a suspect following an officer-involved shooting Wednesday, police said.

An officer responded to a report of a suspicious person using narcotics in the 4400 block of Merced Avenue, just north of Los Angeles Street, about 11 a.m., Baldwin Park police Lt. David Reynoso said.

The circumstances of what took place when the officer arrived were not immediately clear, but an officer-involved shooting took place, Reynoso said.

The officer was not injured, he said. It was not clear if the suspect, who remained at-large, had been wounded. He was believed to be armed.

No further details were available.