A gunman shot and killed two New York City police officers as they sat inside their patrol car in Brooklyn Saturday, then fled to a nearby subway station where he turned the gun on himself.

The attack took place in Brooklyn at around 3 p.m., the New York Daily News reported.

"The perp came out of the houses, walked up behind the car and lit them up," a high-ranking police official told the Daily News. 

The suspect then fled to a nearby subway station before he shot and killed himself.

An NYPD spokesman confirmed to Fox News that two officers were shot in the incident and were immediately taken to a nearby hospital. Police later told The Associated Press that both officers died from their injuries.

The New York Post reported that both officers were shot in the head at point-blank range, and that investigators believed the shooting may have been motivated by the deaths of Eric Garner and Michael Brown.

"I'm Putting Wings on Pigs Today," a person believed to be the gunman wrote in an Instagram post that referenced both Brown and Garner posted just three hours before the officers were shot, the New York Post reported.

"It's an execution," one law enforcement source told The Post.

The gunman just started "pumping bullets" into the patrol car, another source said.

The suspect then fled to a nearby subway statio