(Daily Star)- A video has emerged of the moment Russian Ambassador to Turkey Andrei Karlov was shot dead in an Ankara art gallery Monday evening. Screams could be heard after gunfire erupted in the gallery. The gunman, identified as an off-duty Turkish police officer, is heard shouting "Allahu Akhbar," or "God is great," in Arabic and "Don't forget Aleppo, don't forget Syria!" in Turkish.