Riverside police continue to search for the person who shot a man to death Sunday night, June 25, at a gas station in Riverside.

Police also are trying to determine what prompted the shooting, which occurred about 9:20 p.m. at the 76 station at the busy intersection of Madison Street and Indiana Avenue, said Officer Ryan Railsback. Railsback said officers had not been told of any altercations occurring prior to the shooting.

“No one is in custody,” he said Monday. “We are still reviewing evidence and possibly some video.”

The victim’s name has not been released.

Railsback said the shooting occurred near a tire pump in the back corner of the gas station. A bicycle with a cart attached was found nearby.

Witnesses said they saw police and firefighters performing CPR on a person who was then loaded into an ambulance.

The victim died at Riverside Community Hospital at 11 p.m., Lt. Dan Hoxmeier said.

Alexis Diaz said she was eating across the street at an In-N-Out when she heard several gunshots.

Diaz said she went to the spot near the gas station’s water and air pumps where the man lay and applied pressure to two wounds in the chest and one on his hand. Diaz, 27, said she assists doctors at a surgery center in Riverside.

A Home Depot store and at least three other hamburger restaurants in addition to the In-N-Out are nearby.

Riverside police Lt. Dwayne May said the incident was not an officer-involved shooting. Some social media posts had said an officer fired his weapon.

Riverside police ask anyone with information that may lead to the shooter to call Detective Mike O’Boyle 951-353-7213 or Detective Dave Smith at 951-353-7103.

Staff writers Ali Tadayon and Beatriz E. Valenzuela contributed to this report.