"Local authorities are denying movements on to and off of Incirlik Air Base. The power there has also been cut," the US consulate in Adana said in a message.
"Please avoid the air base until normal operations have been restored," it added. No further details were provided.
According to CNN, airspace over the area has also been closed and power to the facility has been cut.
The closure of the airspace has reportedly led to a halt in US air strikes against Islamic State (IS, formerly ISIS/ISIL). CNN was told by sources that the Turkish authorities did make an exception for US aircraft that had already been deployed on missions before the airspace was shut and allowed them to land at the base.
The air space will be closed until Turkish authorities gain full control over the situation in the region following the coup attempt, Turkish officials told the US, adding that they want to make sure that all elements of the Turkish air force are under the control of pro-government forces, as some warplanes and helicopters were used by rebels overnight.