"US Mission Turkey reminds US citizens that extremist groups are continuing aggressive efforts to conduct attacks throughout Turkey in areas where US citizens and expatriates reside or frequent," the message stated.
The US Embassy in Ankara and the consulates in Istanbul and Adana limited their operations this week following the assassination of Russia's ambassador to Turkey and the arrest of a man who reportedly fired shots outside the US mission in Ankara on Monday.
Russian Ambassador to Turkey Andrey Karlov was shot and killed Monday during a photo exhibition opening in Ankara. Three other people were also injured in the attack.
The Russian Foreign Ministry called the incident an act of terrorism.
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