The attack has been blamed on Islamic State militants with the director of the CIA saying it bears all their "hallmarks".

Officials say the men were initially thwarted by airport security

CCTV images have emerged of two of the men believed to have carried out Tuesday's bombings at Ataturk airport in Istanbul which killed 43 people.

One attacker detonated his explosives downstairs at the arrivals terminal, while another went upstairs and blew himself up in the departure hall.
The third waited outside for the fleeing crowd before setting off the final bomb, Turkish officials said.

The bombers have yet to be identified

The director of the CIA has said the attack "bears all the hallmarks" of Islamic State (IS).
Istanbul's governor's office said more than 230 people were wounded and dozens remained in a critical condition.

Video: Turkey Troubled By Islamic State

At least 13 of the victims were foreigners and several people remain unidentified.
Turkey's Prime Minister Binali Yildirim has revealed the bombers were initially thwarted by airport security.
"When the terrorists couldn't pass the scanners, police and security controls, they returned and took their weapons out of their suitcases and opened fire at random at the security check," he said.
:: Turkey Attack Exposes Challenge Of 'Soft Targets'
As the chaos unfolded, terrified travellers were sent running, first from one explosion and then another.

Video: Airport Bomb Blast Caught On Camera

Airport surveillance video showed a crowd of people, some rolling suitcases behind them, stampeding down a corridor, looking fearfully over their shoulders.
Other surveillance footage posted on social media showed terrified passengers racing for cover from a ball of fire that followed one of the blasts.
Another video showed an attacker blowing himself up seconds after being shot by a security officer.
One passenger, Cihan Tunctas, said he had just got off a flight from Azerbaijan when he heard the sound of gunfire.
"Then the bomb exploded. We were at the exit and... the roof collapsed on our heads," he said.

Video: Panic Inside Istanbul Airport

"The group tried to escape, but their path was blocked by the arrival of a second attacker.
"Two of the security guards noticed him. They walked towards him.
"They just caught him and at that moment he detonated the bomb."
Investigators later found a Kalashnikov assault rifle, a handgun and two grenades on the attacker's bodies, according to the state-run Anadolu news service.
Police who raided two addresses also discovered encrypted organisational documents and computer files, the agency said.

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Some 13 people have been arrested in connection with the bombings. At least three of those in police custody are not Turkish nationals. Security sources have told Reuters news agency that at least one bomber was a foreigner.
Turkey has suffered a spate of bombings this year, including two suicide attacks in tourist areas of Istanbul and two car blasts in the capital Ankara.