From Sky News:
At least 31 people have been killed in an attack on the main airport in Istanbul, a senior Turkish official has told the Associated Press.Initial reports suggest that three men opened fire on the crowd, then detonated themselves when police tried to stop them. Indications are that ISIS was behind the attack.
Initial indications suggest Islamic State was behind the attack, the official said.
Figures suggested up to 50 people had been killed - however that has now been downgraded.