An attack on a nightclub in Istanbul has left at least 39 dead and around 70 injured. A sole gunman is said to have opened fire in the Reina nightclub at about 1:30am local time. The attacker escaped and is now being hunted by police. There were reportedly up to 700 people in the nightclub at the time of the attack. At least 15 of the victims are said to be foreigners. Turkish authorities have imposed a media blackout on coverage of the attack.