PHILADELPHIA -- Stains found in Allen Iverson's car, initially believed by investigators to be smeared blood, turned out not to be bloodstains, a police official said Monday.

Detectives found broken glass in the Cadillac Escalade frequently driven by Iverson's wife, but a police official speaking on condition of anonymity said investigators later determined the stains were some other substance and were not related to the smashed glass.

"His kids ride in the car. We think that the stains probably came from the kids,'' the official said. "It's definitely not blood.''

He declined to say how the determination was made.

Police searched Iverson's suburban Philadelphia home and seized the car Thursday, looking for evidence to back charges that he forced his way into a cousin's apartment with a gun July 3 while looking for his wife.

The Associated Press and Philadelphia Daily News, citing sources speaking on condition of anonymity, reported over the weekend that the search hadn't turned up a gun, but that investigators had found broken glass and bloodstains in the car.

According to court records, police were looking for firearms, cell phones, cell phone records and automobile repair receipts.

Police said Iverson's wife, Tawanna Iverson, had checked into a hotel on July 1 and that Iverson, apparently upset, had gone there looking for her shortly before 3 a.m. on July 3.

At the hotel, he told security guards he was looking for a car with smashed windows, according to court records. He left without finding it, police said.

Prosecutors said that during the same evening, Iverson and his uncle, Gregory Iverson, barged into a Philadelphia apartment and threatened the two men inside. One of the witnesses said Iverson was carrying a gun.

Iverson was to turn himself in Tuesday to face charges of trespassing, assault, making threats, unlawful restraint and carrying a gun without a license. Gregory Iverson also faces charges.

Two of the charges against Iverson are felonies (trespassing and carrying a gun). Should Iverson be convicted of a felony, his contract with the Sixers would no longer be guaranteed, the New York Times reported.

Iverson has $40.5 million and three years remaining on a $70.8 million extension. However, the 76ers would not speculate on how Iverson's case would affect the team or his future.

Allen Iverson's attorneys have repeatedly declined to comment on the case.

The Associated Press contributed to this report.