SPOKANE, Wash. -

Washington's attorney general is trying to prevent the prison release of a convicted pedophile who has committed more than 100 offenses against young girls.

Fifty-six-year-old Stephen Robinson is scheduled to be released from the Washington State Penitentiary at Walla Walla on Friday.

But Attorney General Bob Ferguson say Robinson remains a threat and should be held indefinitely at the state's Special Commitment Center on McNeil Island.

Robinson was convicted of sexually violent offenses against young girls in Benton County in 1984 and in Denver, Colo., in 1999.  Ferguson says he told authorities that he would seek out and attack other young girls if released.

A probable cause hearing could be held as early as Friday.