The United States embassy in Turkey has been closed to the public as of Monday due to a security threat and only emergency services will be provided, the mission said in a statement.
The embassy advised US citizens in Turkey to avoid large crowds and the embassy building, and to be aware of their own security when visiting popular tourist sites and crowded places.
It did not specify what the security threat was that prompted the closure.
Additional security measures were taken after intelligence from US sources suggested there might be an attack targeting the US embassy or places US citizens were staying, the Ankara governor’s office said in a statement.
Visa interviews and other routine services would be cancelled on Monday, the embassy said, adding that it would make an announcement when it was ready to reopen.
The embassy was the target in 2013 of a suicide bombing, claimed by a far-left group that killed a Turkish security guard.