Police have tentatively blamed the shooting of an NYPD officer in the Bushwick section of Brooklyn at 6:16 p.m. Tuesday on friendly fire.

It happened at Troutman Street and Wilson Avenue.

Police say a 36-year-old narcotics officer was shot in the left shoulder and taken to Elmhurst Hospital. He was upgraded to stable condition and is being treated for a single gunshot wound, according to authorities. Officials say he is in good spirits and alert.

Authorities have two suspects in custody and say an additional male suspect remains at large.

At a news conference on the incident, NYPD First Deputy Commissioner Benjamin Tucker said an undercover narcotics officer was attempting to make an arrest as part of a so-called buy-and-bust operation targeting suspected heroin dealers.

Tucker said the preliminary investigation indicated two suspects in a vehicle had made a narcotics sale. An NYPD sergeant and detective approached the vehicle on foot, one on each side.

When the officers identified themselves, Tucker said the suspects backed up and struck a police vehicle. The detective reached into the suspects' vehicle from the passenger side in an attempt to make an arrest.

According to Tucker, the driver accelerated forward while the detective was partially inside the vehicle. Both officers opened fire at that point.

The vehicle continued onward with the detective hanging out the passenger side door a "short distance" before striking another vehicle, Tucker said.

Police arrested both suspects there. The driver of the vehicle was shot in the leg and the wrist, Tucker said. He was listed in stable condition at Bellevue Hospital.

Tucker said the preliminary investigation indicates that a total of four shots were fired, and based on the position of the two officers, it appears that the detective was hit in the crossfire.

This marks the sixth time an NYPD officer has been shot this year.