'Today is a bleak day for diplomatic community' - Foreign Affairs Minister condemns 'brutal assassination' of Russian ambassador
Foreign Affairs Minister Charlie Flanagan has condemned the "brutal assassination" of Mr Karlov.
Releasing a statement soon after the attack, he wrote; "I condemn the brutal assassination of the Russian Ambassador to Turkey. I offer sincere condolences to Ambassador Karlov’s family and loved ones and to the Government and People of Russia.
"Diplomats play critical role in the conduct of relations between States and today is a bleak day for the diplomatic community around the world.”
The United Nations also condemned an attack on the Russian ambassador to Ankara, who was shot and killed in an attack at an art gallery in the Turkish capital on Monday.
"We condemn the gun attack on the Russian ambassador to Turkey.
"There can be no justification for an attack on a diplomat or an ambassador," U.N. spokesman Stephane Dujarric said.
"We hope that the perpetrator will be brought to justice."
Russian Foreign Ministry spokeswoman Maria Zakharova told reporters on Monday that the Russian ambassador to Turkey, Andrey Karlov, had died after being shot by a gunman.
"Today in Ankara as a result of an attack, the ambassador of the Russian Federation to Turkey, Andrey Gennadyevich Karlov, received a wound from which he died," Zakharova said.
"We regard this as a terrorist act."
Meanwhile, UK Foreign Secretary Boris Johnson has condemned the "cowardly" and "despicable" murder.