Some 7,000 armed police with heavy vehicles have surrounded and blocked the Incirlik Air Base in Adana used by NATO forces, already restricted in the aftermath of a failed coup.
Pictures have emerged showing large trucks entering the airbase with the Turkish police subsequently closing the entrance and exit of the airbase.
Rumours suggest the police were deployed to halt a suspected 2nd coup although this is unconfirmed for now.
No further details have emerged yet.
Incirlik Air Base houses American soldiers, represents an important base for NATO and is utilized by the U.S.-led anti-ISIS coalition to carry out airstrikes on ISIS.
However, coup soldiers were said to have used the base as a coordination center, causing the Turkish Government to temporarily close the site and arrest its commander at the time.