PHILADELPHIA - Police say the 30-year-old suspect in the shooting of a Philadelphia police officer told investigators that he opened fire in the name of Islam.

Police Commissioner Richard Ross says Edward Archer pledged allegiance to the Islamic State group. Ross says Archer also told investigators that he believed police defend laws that are contrary to Islam.

Police also say Archer, who has addresses in Philadelphia and the suburb of Yeadon, used a stolen police gun in the crime. 

Police officials say the gun was reported stolen from an officer's home in October 2013 but they don't know how many hands it passed through before being used in the Thursday night shooting.

Archer's mother, Valerie Holliday, told The Philadelphia Inquirer he has been hearing voices recently and that family asked him to get help. She also described him as devout Muslim.

The wounded officer has been identified as Officer Jesse Hartnett. He was shot three times in the arm. Hartnett fired back and wounded the suspect.