Homicide detectives are investigating a Portland police officer-involved fatal shooting in the parking lot outside the WinCo Foods off Northeast 122nd Avenue, just south of San Rafael Street.

One man is dead at the scene. No officers were injured, police said. It marks the second Portland police officer-involved fatal shooting this year.

About 11:30 p.m. Sunday, two East Precinct night shift officers, riding together in one patrol car, contacted a man at or near a car parked in the lot of the WinCo Foods, by the west wall of the store.

Portland police Sgt. Pete Simpson said he did not know whether the man was in the vehicle or outside of it, or why the officers approached him.

"During that contact, shots were fired,'' Simpson said.

Simpson said police fired shots, and called for immediate cover from both North and East Precincts, and for an emergency medical response.

The call for emergency medical came in at 11:58 p.m., according to dispatch records. Police officers tried to provide emergency aid to the man shot before medical arrived. Emergency medics took over but the man was pronounced dead in the lot, Simpson said.

Police recovered a gun at the scene. Witnesses said it was found on the ground near the parked car.

Simpson said he did not know if both officers fired shots, or what prompted them to fire their weapons.

"What exactly led up to that is still an open question for the investigators,'' Simpson said.

The two East Precinct officers, both males, were not hurt.

One passerby said he had heard multiple "bangs" and saw a man down in the lot. The deceased was on the ground in the parking lot, between the WinCo Foods and the Taco Bell store at the corner.

Police detained two witnesses, a man and a woman, for questioning, Simpson said. He did not say whether or not these witnesses were in the parked car linked to the man killed. No arrests were made.

Police set up two mobile precincts in the parking lot of the WinCo.

Forensic criminalists were operating the bureau's Leica 3D digital imaging scanner and camera to capture the crime scene.

As they did so, shoppers continued to buy groceries at the 24-hour store through the early morning hours Monday.

Police Chief Larry O'Dea, Mayor Charlie Hales and Assistant Chief of Investigations Donna Henderson were among those who responded to the scene. Members of the East County Major Crimes Team, Portland's Independent Police Review Division, the Police Bureau's internal affairs and training divisions, and a prosecutor from the Multnomah County District Attorney's Office also responded to the scene.

Northeast 122nd Avenue, from San Rafael south to Halsey Street, was closed to traffic for about four hours. The street was reopened by 4 a.m.

Portland police expect to release more information Monday afternoon.

(Go here for the updated story on the man shot.)

--Maxine Bernstein

mbernstein@oregonian.com

503-221-8212; @maxoregonian