SHELL LAKE, Wis. (AP) _ An 18-year-old man accused of murdering his parents escaped with another prisoner from a northwestern Wisconsin jail early Saturday.

Washburn County Sheriff Don Fuller said late Saturday afternoon that investigators had found no sign as yet of Todd A. York, who is scheduled for trial Oct. 2 in the shooting deaths of his parents.

''We've been following a lot of leads,'' Fuller said.

He said law enforcement agencies throughout Wisconsin and surrounding states were alerted of the escape, and the search would continue Saturday night.

''All they had on was jail coveralls and small sandals - almost barefoot,'' the sheriff said. ''Whether they were picked up outside, we just don't know.''

Fuller said the two, who had been cellmates since the other escapee was jailed May 13, used hacksaw blades to saw through the bars of an outside window.

The sheriff said it was not known how they obtained the cutting device, although it was possible to pass things into the jail through windows.

''We're dealing with a 100-year-old jail here,'' he said.

Fuller said York, 18, of rural Spooner, who was being held on two counts of first-degree murder, and Keith Thompson, 17, of Trego, held on a burglary charge and a probation violation, escaped sometime after 2 a.m.

York was accused of the Sept. 8, 1988, slayings of his parents, William and Wanda York, both 49, in their home about two miles northwest of Spooner. Authorities said each had been shot once in the head with a rifle.

The criminal complaint filed in the case contends York got into a quarrel with his parents after he and his father returned home from a carpentry job.

York had been freed on a $100,000 cash bond after being charged. He was put in the custody of relatives in northern Illinois, but did not maintain required contact with authorities and was arrested in March on a bail jumping charge.