BLUFFTON, Ind. (WFFT) -- Authorities are investigating a fertilizer leak in Bluffton that has killed a number of fish in the Sixmile Creek.

The Indiana Department of Environmental Management says it first received a report of a dead fish on Saturday, April 3 from the Department of Natural Resources.

On Sunday, the DNR reported a “foreign substance” in the creek, IDEM said in an email to FOX55.

IDEM says the leak began around S. 500 E. and E. 550 S.

Crews are working to dam the creek so the chemicals don’t contaminate the Wabash River.

Scott Shoup works for Six Mile Cemetery, which owns the property where the last dam is being built.

He’s been talking with authorities as they’ve been working.

“I’m not too concerned at this point in time about anything getting into or anything further getting into the Wabash,” he said.

The water level behind the last dam is significantly higher than on the other side flowing into the river.

The Wells County Emergency Management Agency said recent tests of the river showed no contamination.

The rest of the leak is still under investigation by the DNR, according to IDEM, including how many fish were killed and what species were affected.

We’ll have more information for you as it becomes available.