Chemical warfare and explosives experts decided that the remains of World War II era chemical munitions testing kits discovered buried in a trench at Warren Air Force Base are not dangerous, an Air Force spokesman said Friday.

The kits were discovered by an explosives ordnance disposal team from Hill Air Force Base, Utah, and Ellsworth Air Force Base, S.D., during a regular sweep to find old ordnance on the west side of the base Wednesday. Sgt. Keith Gardner said the kits were tested by chemical warfare and explosives experts from the U.S. Army Technical Escort Unit at Aberdeen Proving Ground, Md., who found the remains were inert and posed no threat."They found some glass vials, plastic kits, containers, things like that," Gardner said. "Someone had dug a trench, burned them and put dirt in over the top of them."

The kits apparently were burned and the remains were buried between 1945 and 1947, said Gardner. That was a standard disposal procedure at that time, he said.

Base records did not show when the kits were burned, he said. Officials estimated the kits were burned before 1947, probably between 1945 and 1947, because that is when the Air Force was created from the Army Air Corps and Warren became an Air Force base.

"We couldn't find any records to determine what they were," said Gardner.

During World War I and World War II, he said, artillery units were stationed at Warren.