LEXINGTON, Ky. (AP) — The first mustard gas leak in three years was confirmed Tuesday at a chemical weapons stockpile in Kentucky, less than a month after workers there found a leak inside a separate storage igloo housing a deadly nerve agent.

But officials said the latest leak poses no danger to the community or the surrounding atmosphere.

Richard Sloan, public affairs officer for the chemical storage site at Blue Grass Army Depot in Richmond, said trace amounts of mustard gas vapor were detected during a routine inspection of a storage area this week. Army workers won't know whether there is also a liquid leak until a closer inspection inside the igloo.