RICHMOND, Ky. (AP) -- Low levels of a deadly nerve agent have been detected in a chemical weapons igloo containing M55 GB, or sarin, rockets at Blue Grass Army Depot in central Kentucky.

The Army Chemical Materials Agency says there's no danger to people in Madison or surrounding counties and that state and local emergency officials have been notified of the leak.

Toxic chemical workers have connected a 1,000 cubic feet-per-minute filter to the igloo's rear vent.

The agency says the leak was discovered during weekly monitoring.