The North Carolina Division of Water Quality is investigating the deaths of hundreds of fish in Leith Creek in Laurinburg.
The fish kill was discovered by residents earlier this week.
Fish carcasses are up and down both sides of the banks of Leith Creek.
Inspectors with the NC Division of Water Quality were at the site this week to collect samples for testing.
"My staff has been out, this, a couple of days looking at the creek. And also collecting samples and trying to gather information to determine exactly what caused the fish kill," said Betty Henson, NC Division of Water Quality.
Henson says it could be a while before the test results are complete.
Laurinburg officials are asking that you not eat any fish from the creek until they determine what's behind the fish kill.