The U.S. is condemning the assassination of the Russian Ambassador, with U.S. Secretary of State John Kerry offering assistance to Russia and Turkey as they investigate this "despicable attack."
The White House says the shooting of diplomats is unacceptable.
Andrey Karlov was shot by a single gunman shouting "don't forget Syria!" during an event at an art gallery.
Pentagon spokesman Peter Cook.
IN: "We are...
OUT: ...their families."
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