HUNTERSVILLE, N.C. -- Authorities warned the public not to panic over heavy columns of black smoke that were visibly rising from Duke Energy's McGuire Nuclear Power Plant Wednesday morning.

The black smoke was due to a fire in the transformer switch yard at the nuclear power plant, authorities said.

"There are no evacuations and no need to be concerned," Huntersville Fire Department tweeted.

Huntersville Fire said they used flowing foam to put out the contained fire.

Multiple fire crews were on scene Wednesday morning around 9 a.m. assisting Duke Energy crews. They said there was no impact to the plant or public. The fire is under investigation.