A GUNMAN has reportedly opened fire in a mosque in Istanbul, less than 24 hours after 39 people were killed in an attack on a nightclub.

Two people were injured and rushed to hospital after a man opened fire with a rifle when people were gathering at north Istanbul's Hasan Pasha Mosque for prayer this afternoon.

4 The scene outside the mosque after the shooting this afternoon Credit: Twitter

4 Worshippers were gathering to pray when a gunman opened fire and injured two people Credit: Google Earth

Police have launched an investigation into the shooting, which they say they have no reason to believe it had a "political cause" behind it.

One report claims that the shooting was a family argument, and a man opened fire on his father during an argument, injuring him and the man standing next to him.

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The shooting comes just hours after a terrorist dressed as Santa gunned down New Year's Eve revellers at the Reina nightclub in the city.

The attacker — who may have had an accomplice — shot and killed a police officer outside the venue before forcing his way inside to go on his bloody rampage.

Dramatic footage captured the moment the gunman opened fire, showing bullets pinging off cars as she shot his way through the street outside.

As many as 700 people had been inside the club at the time of the attack, which happened at around 1.20am local time.

4 The gunman fled the scene of the attack as the two victims were rushed to hospital Credit: Twitter

4 Reports are now emerging the attack may be a family argument between a dad and his son Credit: Google Earth

A massive manhunt has now been launched for the gunman.

More to follow.

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