Witnesses have described the bloodshed and carnage after three suicide bombers opened fire then blew themselves up in Istanbul's main international airport.
A total of 36 people are dead and close to 150 wounded after an attacker sprayed the departures hall with an automatic rifle, sending passengers diving for cover and trying to flee, before all three blew themselves up in the arrivals hall a floor below, witnesses and officials said.
Turkey's prime minister said it appears to have been an attack by ISIS terrorists.
CCTV has emerged that appears to show one of the gunmen, wearing a dark jacket and red top, aiming an assault rifle.
Most of those killed were Turkish nationals but foreigners were also among the dead, a Turkish official said.
The Foreign Office said it was "urgently seeking further information" about possible British casualties.