A woman drove off in an unmarked Hoboken police car early Saturday morning, police said.

At 2:33 a.m., a police officer in civilian clothing stepped out of the black Crown Victoria at 220 Seventh St., because he noticed three people urinating in public, according to police reports.

As he was writing summonses for the three individuals, a cab driver notified the officer that a woman had gotten into the police car.

When the officer turned around, he saw the car speeding off, police said.

The car was found, abandoned, at 1033 Bloomfield St., police said.

The case is still under investigation, police said.