NORTH PLATTE, Neb. (AP) — Officials are trying to determine what killed as many as 3,000 fish found dead along the shore and in a western Nebraska lake.

The fish kill was reported Saturday at Lake Maloney, which sits about 3 miles (5 kilometers) south of North Platte. Most of them were white bass or wipers.

The Nebraska Game and Parks Commission says disease is suspected, but test results won’t be available for two to three weeks.