Gunman still at large in Istanbul following shooting of 39 people

Tourists have been warned to "remain vigilant" in Istanbul, where at least 39 people - including 15 foreigners - have been killed by a gunman.

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.

Vasip Sahin is the governor of the Turkish city:

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