A U.S. soldier was being held on espionage charges Friday after he allegedly supplied East Germany with secret U.S. plans for defending against a communist invasion, the Army said.

The Army said East German officials told U.S. military authorities that Spec. 4 Michael A. Peri had contacted them during the soldier's mysterious 11-day disappearance.Peri vanished on Feb. 21 from his unit near the East German border, taking with him a portable computer that belonged to the unit. Peri, who worked as an electronics warfare specialist, turned himself in 11 days later.

On Thursday, the Army said that the 21-year-old soldier from Laguna Niguel, California, had been charged with espionage.