Gunshots were fired at the USA embassy in the Turkish capital, Ankara, early on Monday, police said, in the midst of a diplomatic crisis that has enraged many Turks.
US embassy spokesman David Gainer would only confirm that a "security incident" took place. The embassy was set to be closed this week for a public holiday to mark the Islamic Eid Al Adha festival.
Video footage from broadcaster Haberturk showed police inspecting one of the entrances to the building and what looked like damage inflicted on a window by a gunshot could be seen.
The U.S. Embassy in Turkey was shot at from a moving vehicle before dawn on Monday, an attack that came during heightened tensions between the two North Atlantic Treaty Organisation allies.
US administration had imposed sanctions and vows to do more against Turkey in the case the pastor would not be released immediately. It said empty cartridges were found at the scene. He thanked Turkish police for their "rapid response".
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Embassy spokesman David Gainer said: "We can confirm a security incident took place at the U.S. Embassy early this morning".
İbrahim Kalın, a presidential spokesman, also condemned the attack and reassured that "Turkey is a safe country and all foreign missions are under the protection of law".
Credit rating agencies S&P and Moody's both downgraded Turkey late Friday, stoking fears about the state of the Turkish economy.
US President Donald Trump has doubled the tariffs on aluminium and steel tariffs from Turkey, prompting Ankara to sharply hike tariffs on several US products.
Turkey has long criticized the United States for not agreeing to hand over Fethullah Gulen, a Muslim cleric accused by Turkish authorities of engineering an attempted coup in 2016.