An Amarillo, Texas nuclear plant was put on precautionary lockdown after armed hunters were spotted in a field across from the plant, the Carson County Sheriff's Department said.

Pantex Plant activated its Emergency Response Organization at 8 a.m. Friday in response to a possible security situation. Pantex employees were moved to a safe location.

Police were on the scene and said there was no danger to the public.

"They did have it locked down," said an official, who wished to remain anonymous, at the Texas Department of Public Safety, according to Reuters. "There was no security breach. It was purely a precautionary measure."

The Pantex Plant is a nuclear weapons assembly and disassembly facility.