Channel 4 reports early details on an oil spill of unknown source and size in Lake Hamilton, from which Hot Springs draws its drinking water. The city says the spill is six miles below the city water intake and will not affect the water supply.

Though the stuff floating on the surface appears to be oily, it’s not certain what the substance is.

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Said a spokesman for the Arkansas Department of Environmental Quality, which learned of the report at 10:18 a.m.:

We are communicating with local authorities. There’s not a confirmation of an oil spill, but there is a sheen. The County’s OEM is investigating, but the source is still unclear. The substance is breaking up as the wind hits.