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This is the first footage from inside a nightclub in Turkey where at least one gunman opened fire tonight, killing at least 39 people and wounding 69.

The CCTV allegedly shows an attacker prowling around the famous Reina club in Istanbul just moments after they opened fire.

Up to two attackers are believed to have raced into the venue wearing Santa outfits, according to reports.

Turkish journalist Ürün Dirier has tweeted what is reportedly CCTV from inside the club.

A man wearing a white jacket and white bobble hat is seen making his way across the nightclub floor surrounded by debris.

(Image: Twitter) (Image: Twitter)

Just before he goes out of view he drops something to the ground.

Armed police are on the scene and it is believed the perpetrator may still be inside.

One gunman remains hiding in the toilets after the shooting, local media claim.

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(Image: Twitter)

Security services said an operation is ongoing.

It was estimated up to 800 people may have been in the Reina nightclub at the time of the shooting.

Pictures and video show armoured vehicles surrounding the venue after the incident which began around 1.20am local time.

Celebrities including Sting, Paris Hilton and Gisele Bundchen have visited in the past.

Istanbul had been on high alert for any terror attacks, with some 17,000 police officers on duty in the city.