Crews on Friday finished skimming the entire cove at the Tahoe Keys where an oil spill was first reported on April 11.

“We have not identified a source or what exactly it was,” Cathe Pool with Lahontan Regional Water Quality Control Board told Lake Tahoe News.

Samples taken Monday and Thursday were sent to a lab for testing.

Several boats were looked at, but none was the source of the leak that caused a slick, thin sheen to cover much of the lagoon and boat slips near the professional buildings.

“[Tahoe Keys Property Owners Association] said when they first saw it, they could see rainbows. That’s typical of gas, but it didn’t smell like gas and we didn’t see the rainbows after that,” Pool said.

— Lake Tahoe News staff report