Northwest District police called to investigate a domestic incident in the city’s Forest Avenue-Grant Street area early today found anything but a domestic dispute.

Instead, according to police reports, they found two people engaged in sexual contact in a parked vehicle. And police later confiscated a bag of heroin from the car, along with some marijuana and a crack pipe hidden on the female’s body.

Police were called to a Barry Place address, one block east of Grant and south of Forest, at about 2:30 a.m.

Responding officers found the man and woman in the vehicle, both partially clothed, and searched them for the officers’ safety. Police said they found a bag of heroin under the driver’s seat, along with some marijuana found in the woman’s body cavity. Cell-block attendants later found a crack pipe with residue in a body cavity, authorities said.

Officers charged Walter S. Banks Jr., of East Ferry Street, and Brittany M. Johnson, 22, of Riverside Avenue, with criminal possession of a controlled substance, public lewdness, tampering with physical evidence and marijuana possession, among other charges, according to police reports.

Police also accused Banks of driving a stolen vehicle, with a revoked license.