Tourists have been warned to "remain vigilant" in Istanbul, where at least 39 people – including 15 foreigners – have been killed by a gunman.
Tourists have been warned to "remain vigilant" in Istanbul, where at least 39 people – including 15 foreigners – have been killed by a gunman.
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The man – reportedly dressed as Santa – shot his way past a police officer to get in to a nightclub.
Around 70 others were injured by the shooter – who is still on the run.
