Around 20 Islamic State members in custody over Istanbul airport attack: Erdogan

One of the bombers is identified on CCTV at Ataturk Airport in Istanbul

One of the bombers is identified on CCTV at Ataturk Airport in Istanbul

Turkey's state-run news agency says police have conducted a series raids in Istanbul neighborhoods, targeting Islamic State suspects following the gunfire and suicide bomb attack at Ataturk Airport which killed 42 people.

Turkish TV channel NTV claimed that one of the two was wanted on suspicion that he would carry out suicide attacks in the capital Ankara or in the southern city of Adana, but did not cite its sources.

"One of them blew himself up outside and the other two took advantage of the panic during the opening of the fire, entered inside and blew themselves up". That combination is military-grade, raising the question of how the attackers obtained the bombs, said Jimmie Oxley, a chemist and explosives expert at the University of Rhode Island.

Istanbul's governor's office said more than 230 people were wounded and dozens remained in a critical condition. The attackers were spotted soon after they emerged from a taxi outside the airport; at least two were shot by security forces, and only one made it inside the global terminal. Forensics teams had been struggling to identify the bombers from their limited remains, officials said earlier.

"A medical team is working around the clock to conclude the identification process", one of the officials said.

The three suspected bombers were from Uzbekistan, Kyrgyzstan and Dagestan - a federal subject of Russian Federation bordering Chechnya - a Turkish government official said. The Russian interior ministry said it was checking information about Vadinov.

The Kyrgyz security service declined to comment, while the Uzbek security service could not immediately be reached.

Nikolai Patrushev, the head of Russia's Security Council, sent a telegram to his Turkish counterpart calling for cooperation in fighting terrorism after the bombing, Russian news agencies reported.

The police simultaneously raided 16 separate places in Istanbul, detaining 14 suspects, including three foreigners, Reuters cited a Turkish official as saying on Thursday.

Turkish officials refused to confirm either report.

Turkey has suffered a string of deadly attacks in the past year blamed on either IS or Kurdish rebels, and the airport attack comes just at the start of the crucial summer tourist season.

Islamic State has established a self-declared caliphate on swathes of both Syria and Iraq and declared war on all non-Muslims plus Muslims who do not accept its ultra-hardline vision of Sunni Islam. The self-styled caliphate prizes ambiguity about its operations in Muslim majority Turkey and did not claim responsibility for the assault by multiple gunmen wearing suicide-bomb vests.

The director of the Central Intelligence Agency has said the attack "bears all the hallmarks" of Islamic State (IS).

Islamic State has not said it was behind the attack, but it is known to use Turkey as a crossing point to establish itself in neighbouring Syria and Iraq, and the group boasted this week of having cells in Turkey, among other countries.

Turkey has accused ISIS of carrying out the attack at the Istanbul airport, an attack that was well planned and executed, but could have been far worse if not for the fearless actions of Turkish security forces.

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