The U.S. Consulate in Istanbul, Turkey’s largest city and a major tourist destination, will not provide services Wednesday in connection with a possible security threat, U.S. officials said.

State Department spokesman John Kirby on Tuesday did not describe the nature of the threat. However, the U.S. Embassy in Ankara as well as the consulate in the city of Adana, which neighbors a base in the town of Incirlik used by the U.S. Air Force, remain open.

Turkey faces a variety of terror threats, including those posed by the Islamic State group operating along Turkey’s border with Syria and Kurdish separatists whom Turkey has been battling for years.

The latest threat warning follows an advisory issued to U.S. citizens on Friday urging them to stay away from the Istanbul consulate through the remainder of the weekend.

“This supersedes anything that went before,” Kirby told reporters in Washington. “Obviously, we want people to be mindful of the threat around the consulate in Istanbul. And clearly, send a security message that people should take pains to avoid that area.”

Meanwhile, U.S. military forces have been restricted from traveling to Turkey in connection with concerns about security in the country.

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