Tucson police are asking for help in locating a vehicle and its occupants who are tied to the killing of a teenager Saturday night on the south side.

Antonio Flores, 17, was shot and killed by someone in a “greenish-colored sport utility vehicle, van or crossover-type vehicle,” said Sgt. Maria Hawke,  a Tucson police spokeswoman. Flores was previously reported as being 18.

The year of the vehicle is not known.

The incident began shortly after 10 p.m. at a Circle K at South Campbell Avenue and East Drexel Road. Flores and five others were in a Chevrolet Silverado parked at the store when a dark-colored vehicle approached, Hawke said.

One of the occupants of the vehicle fired an unknown projectile, possibly from a BB or pellet gun, at the Silverado, said Hawke in a news release.

The dark-colored vehicle left the Circle K parking lot and headed west on Drexel. The occupants in the Silverado followed in an effort to get the vehicle’s license plate number, said Hawke.

The truck caught up to the vehicle at Drexel and South Copper Plate Avenue. where multiple gunshots were fired at the truck, striking Flores at least once, said Hawke.

Homicide detectives believe rifles or shotguns were used, Hawke said.

The dark-colored vehicle was last seen southbound on Copper Plate. The truck continued west on Drexel, and the occupants flagged down a police officer at South Park Avenue, Hawke said.

They told the officer that Flores had been shot. The officer called for additional units, and began CPR on the teen until Tucson Fire paramedics arrived.

Flores was taken to a hospital, where he was pronounced dead shortly after 11 p.m., Hawke said. Nobody else was hurt.

Anyone with information is asked to call 911 or 88-CRIME.