An individual opened fire at 3.50am (00.50am GMT) in front of the US embassy in Ankara before being detained by police. No one was harmed.
The man took out a pump action shotgun he hid in his coat and fired around eight shots in the air before the embassy's security guards intervened and apparently overpowered him.
The embassy said its missions in Ankara, Istanbul and the southern city of Adana would be "closed for normal operations on Tuesday", the Telegraph reports.
