Video footage from broadcaster Haberturk showed police teams inspecting one of the entrances to the embassy and apparent damage caused by a gunshot could be seen in one window. The spokesperson added, "We have no reports of any injuries and we are investigating the details". It said empty cartridges were found at the scene.
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.
A vehicle passes by a security booth with a bullet hole in a window, at the entrance of the US Embassy, in Ankara. Ankara accuses Gulen of having masterminded the July 2016 coup attempt against President Recep Tayyip Erdogan.
In response, USDTRY edged higher Monday at the start of a week of Turkish public holidays even though traders welcomed a currency swap agreement between the central banks of Turkey and Qatar to provide liquidity to Turkish markets and support financial stability.
The US had doubled tariffs on Turkish steel to 50 percent and aluminium to 20 percent, which sent the lira tumbling to a record low of 7.24 to the dollar on Monday and rattling global stock markets.
Also, President Donald Trump has doubled the tariffs on aluminium and steel imports from Turkey, prompting Ankara to sharply hike tariffs on several U.S. products.
"There is no difference between the direct attacks on our call to prayer and our flag and the attack on our economy", said Erdogan, a pious Muslim who has drawn on religious and nationalist references in comments about the standoff.
"They are now holding our wonderful Christian Pastor, who I must now ask to represent our Country as a great patriot hostage".