(CNN)A gunman assassinated Russia's ambassador to Turkey on Monday, shouting "Allahu akbar" as he opened fire on Andrey Karlov at an art exhibition in Ankara.

Russia's foreign ministry described the shooting, which was captured on video, as a "terror attack."
"We are currently in contact with Turkish authorities, who are assuring us that a thorough, comprehensive investigation will be conducted," foreign ministry spokeswoman Maria Zakharova said in remarks broadcast on Russian television. "Murderers will be punished. Terrorism won't sustain. We'll fight it."
Here's what we know right now:
• Karlov was giving a speech at the opening ceremony of a photo exhibit when an assailant opened fire.
People cower after Karlov was shot. "Get back! Get back!" the gunman could be heard shouting in Turkish.<br />
Photos: Shooting unfolds in front of photographer
People cower after Karlov was shot. "Get back! Get back!" the gunman could be heard shouting in Turkish.
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The gunman shouts near the body of Karlov. "Only death will remove me from here. Everyone who has taken part in this oppression will one by one pay for it," he said in the video.
Photos: Shooting unfolds in front of photographer
The gunman shouts near the body of Karlov. "Only death will remove me from here. Everyone who has taken part in this oppression will one by one pay for it," he said in the video.
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Turkey's official Anadolu news agency reported that the gunman had been neutralized. But it was not immediately clear whether he was killed or captured by police.
Photos: Shooting unfolds in front of photographer
Turkey's official Anadolu news agency reported that the gunman had been neutralized. But it was not immediately clear whether he was killed or captured by police.
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