At least 28 people have been killed and many more were wounded in a suicide attack at the main airport in Istanbul.zturkTwo attackers opened fire before blowing themselves up at the entrance to Istanbul Ataturk Airport’s international terminal, an official said, citing information from the interior ministry.

Turkey’s state-run Anadolu Agency said around 60 people were wounded, six of them seriously. Police fired shots to try to stop the attackers but they detonated their explosives, the official said.

A witness told NBC News that he saw a police officer diving to tackle one of the attackers – who then detonated his bomb. The explosions are understood to have happened at the arrivals hall before the attackers would have gone through security checks, officials said.

Pictures posted on social media showed wounded people lying on the ground inside and outside the terminal buildings. Other social media footage showed crowds of people stuck inside shops at the airport. All flights to the airport have been diverted.