The Army has temporarily halted destruction of chemical weapons in Colorado to repair a small dent in the door of a chamber used to explode shells.

Pueblo Chemical Depot spokesman Tom Schultz said Thursday no chemicals escaped and no one was injured.

The damage was discovered Aug. 7 and repairs are underway. Schultz says operations could resume by Oct. 5.

The chamber is used to explode and neutralize shells containing mustard agent. It's one of two methods the Army will use to destroy about 780,000 shells containing 2,600 tons of mustard agent under a treaty banning chemical weapons.

Officials believe the dent was caused by a metal fragment caught in the door when it was sealed shut.

Schultz says the dent was about one-quarter inch wide and three-quarter inch long.