LEXINGTON, Ky. (AP) — Officials at a chemical weapons stockpile in Kentucky suspect rising summer temperatures are partly responsible for the second mustard gas leak in less than two weeks after the storage site went three years without one.

Like the previous leak detected on July 28 at a separate storage igloo, the one found Wednesday at Blue Grass Army Depot in Richmond was only a low concentration of the blister agent and not considered dangerous to the community or environment.