"We can confirm a security incident took place at the U.S. Embassy early this morning".
The U.S. embassy in Ankara and the consulate in Istanbul have been the targets of attacks by militants and have faced numerous security threats in the past. "We have no reports of any injuries and we are investigating the details", David Gainer, the spokesperson of the US Embassy told the Hürriyet Daily News.
A day earlier, Turkey said it was increasing tariffs on imports of certain USA products in response to American sanctions on Ankara that caused the value of the lira to plunge.
A bullet mark was visible on a security booth at the embassy, an AFP journalist at the scene reported.
Omer Celik, spokesman for the ruling Justice and Development Party (AKP), called the incident an "open provocation" and a clear attempt to "create chaos".
The attack comes amid tensions rising between Ankara and the United States over the detention of Andrew Brunson, an American pastor, in Turkey over terror-related charges.
The early morning attack coincided with a deepening row between the two countries over the trial of a US pastor in Turkey.
And Turkey on Friday threatened to respond in kind if Washington imposed further sanctions, while a court rejected last week another appeal to free pastor Andrew Brunson.
Turkish President Recep Tayyip Erdogan has called for a boycott on US -made electronic products, with some citizens heeding his call and filming themselves breaking their iPhones.
The president said those who believed they would bring Turkey to its knees through the foreign currency exchange rate would "soon see they are mistaken". The US also raised tariffs on Turkish metal exports, which prompted calls by Turkish PresidentRecep Tayyip Erdogan to boycott US goods.
Relations between the two North Atlantic Treaty Organisation allies have plummeted in one of their worst crises in decades after the detention of Mr Brunson on terror-related charges.