Update: Lockdown Lifted at Davis-Monthan Air Force Base in Arizona

January 23, 2017 Updated: January 23, 2017

Update: Davis-Monthan Air Force Base confirmed later that the lockdown was lifted. “All clear, the lockdown has been lifted. Base personal are free to resume all normal operations. We will continue with updates as available,” it wrote.

It’s unclear exactly what happened or if there had been a shooting.

A Pentagon official told Fox News that it likely was a false alarm.

Two airmen on a base flight line believed they heard “gunshots,” the Pentagon official told the news outlet.

Davis-Monthan Air Force Base in Arizona was placed on lockdown on Monday morning after unconfirmed reports of shots fired.

“The base is currently on lock down. There are unconfirmed reports of gun shot sounds. Seek shelter immediately. More updates will come once they are available,” it wrote Monday.

Officials urged everyone to seek shelter as security investigated.

The base is home to the A-10 Warthog and the “boneyard,” where more than 4,000 retired U.S. Air Force aircraft are kept.

Borman K-8 School is located on the base, and it was placed on a “soft lockdown,” it confirmed.

“Lock-down update: All students and staff are accounted for and are safe. We are following base instructions. Will keep parents updated,” wrote the Sonoran Science Academy Davis-Monthan, also located inside the base.

Davis-Monthan Air Force Base is located in Tuscon.