COLUMBUS, Ohio (AP) -- State park officials have posted signs at a central Ohio beach to warn visitors about toxic blue-green algae in the water.

The Columbus Dispatch ( http://bit.ly/SfBSqE ) reports officials at Buckeye Lake State Park posted the health warnings at Brooks Beach after recent water samples showed a type of toxin in the algae was at a concentration exceeding a state health standard.

The posts specifically target the elderly and the very young, as well as people with weakened immune systems.

Health signs warning about toxic blue-green algae also were posted at four beaches in Grand Lake St. Marys in western Ohio in May.

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Information from: The Columbus Dispatch, http://www.dispatch.com