Shots have been fired outside the US Embassy in Ankara, less than 24 hours after the Russian ambassador to Turkey was shot dead.
Turkish police have detained a man, state-run Anadolu agency reports.
Anadolu says the man fired eight or nine shots into the air from a pump-action shotgun hidden in his coat at around 3:50am local time.
In light of recent events, the US embassy in Ankara and its consulates in Istanbul and Adana will be closed on Tuesday.
There are no reported injuries.
Reuters / Newshub.