20 December 2016, 17:32 GMT
WASHINGTON (Sputnik) — On Monday, Karlov was killed by a gunman during a photo exhibition opening in Ankara. Three other people were also injured in the attack. The Russian Foreign Ministry called the incident an act of terrorism.
"The Secretary also offered US assistance to the investigation into the horrific murder of Russian Ambassador to Turkey Andrey Karlov," Kirby stated on Tuesday.
Earlier it was reported that Kerry raised concerns with Cavusoglu over the allegation that Washington was involved in the assassination of the Russian Ambassador.
