Detectives are still trying to piece together a puzzling week-old shooting linked to NFL star receiver Marvin Harrison.

Crime-scene investigators yesterday pried a total of three stray bullets from two houses on Thompson Street near 25th in North Philly, where Harrison owns a garage and car-detail shop, police sources said.

It was on that same stretch of Thompson Street that an unidentified 32-year-old man suffered a bullet wound to the hand last Tuesday after a fistfight with Harrison, 35, the sources said.

The victim - who thus far has refused to identify the gunman - was kicked out of a bar that Harrison owns, Playmakers, on 28th Street near Cambridge, about two weeks earlier, and continued to bicker with Harrison in the days following, the sources said.

Although no witnesses have implicated Harrison, investigators started to focus on him last Wednesday, when ballistics tests confirmed that five shell casings found at the crime scene had come from a high-powered Belgian handgun that Harrison owns.

Police found the weapon inside Harrison's garage. During a four-hour interview at Central Detectives last week, Harrison admitted having been involved in the fistfight but insisted that he had not been involved in the subsequent shooting, the sources said.

Harrison, who played football at Roman Catholic High School and went on to become a wide receiver with the Indianapolis Colts, has not been charged with any wrongdoing.

Investigators said they would test the slugs found yesterday to determine if they also had been fired from his gun. *