LINCOLN, Neb. (AP) — State health and environment officials have issued health alerts for toxic blue-green algae at Iron Horse Trail Lake in Pawnee County and Kirkman’s Cove in Richardson County.

Officials say in a news release Friday that the alerts were issued following tests of the lake water. An alert has ended at Harlan County Reservoir.

Skin exposed to the toxin from certain strains of blue-green algae can develop rashes and blisters. Someone who drinks water containing the toxin is at risk for headaches, nausea and muscular pain.