Note: This story was last updated at 10 a.m.

All entrances at the Y-12 National Security Complex have been closed due to a “security situation,” officials said Thursday morning.

Y-12 posted the announcement on social media.

“Entrance to the site will not be possible until further notice,” the announcement said.

A press release from the National Nuclear Security Administration said officials at Y-12 are responding to a law enforcement issue that has affected access to Y-12.

“The facility and its employees are safe and secure, and all entrances to the plant are closed,” the release said. [Read more…]