Gunman shouted 'Allahu Akbar... Do not forget Aleppo!' as he shot ambassador

(CNN)A gunman shouting "Do not forget Aleppo!" assassinated Russia's ambassador to Turkey at an Ankara art gallery on Monday in what leaders of Russia and Turkey called a provocative terror attack.

Ambassador Andrey Karlov's shooting was captured in real time in photos and video that quickly spread through the Internet worldwide.

The assassination comes at a time of improved relations and increased cooperation between Russia and Turkey. Leaders of both countries vowed to not let the assassination cast a shadow over that friendship. It also comes during a pivotal moment in Syria, where Russia has been instrumental in President Bashar al-Assad's push to retake rebel-held parts of Syria.

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