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A US nuclear weapons facility has reported it is 'experiencing an operational emergency'.

Pantex Plant in Amarillo, Texas, tweeted: "The Pantex Plant is experiencing an operational emergency. The Emergency Response Organization has been activated."

They later added: "Precautions are being taken due to a security event. Access to FM2373 has decreased north of Hwy. 60. Other precautions include assistance from Carson County Sheriff and @AmarilloPD.

"The security event at Pantex has ended without incident. Thanks to the Carson County Sheriff and @AmarilloPD for their quick response."

Carson County Sheriff Department is reporting that FM 2373 is closed from I-40 north.

Officials are also reporting the east side of the Pantex Plant is completely inaccessible.

(Image: Pantex)

There appears to be no off-site impact at this time and there no need for the public to take any action.

The Emergency Response Organization are a highly-trained group of employees with detailed knowledge of plant operations and emergency response procedures.

Pantex Plant is the primary United States nuclear weapons assembly and disassembly facility.

As a major national security site, the plant and its grounds are strictly controlled and off-limits to all civilians.

The airspace above and around the plant are prohibited to civilian air traffic.