A U.S. District Court suit has been filed by a woman who was sexually assaulted by a Utah State Prison inmate while both were fighting a forest fire at Yellowstone National Park last August.

The woman, listed as a resident of Issaquan, Wash., filed suit against state officials and Roger Lopez, the man who pleaded guilty on Jan. 27 to sex abuse stemming from the incident, which occurred Aug. 16, 1988.The plaintiff was a student at the Anaconda Job Corps Center at Anaconda, Mont., at the time. Lopez was a member of the prison's firefighting unit, the Flame 'n Goes.

The suit says officials were negligent in that they failed to properly guard Lopez and allowed him to join the firefighting unit.

Because of the assault, the woman "incurred expenses for medical and psychological care," and suffered permanent psychological damage, the suit says. It asks for damages to be determined at trial.