A Turkish government official said on Thursday, June 30, Censor.NET reports citing Reuters.
The official gave no further details beyond confirming the attackers' nationalities and declined to be named because details of the investigation have not yet been released.
"A medical team is working around the clock to conclude the identification process," one of the officials said.
The pro-government Yeni Safak newspaper said the Russian bomber was from Dagestan, which borders Chechnya, where Moscow has led two wars against separatists and religious militants since the Soviet Union collapsed in 1991. The Kyrgyz security service declined to comment, while the Uzbek security service could not immediately be reached.
Turkish police detained 13 people, three of them foreigners, in raids across Istanbul in connection with Tuesday night's attack.
As reported, in the evening of June 28, an explosion rocked the Ataturk international airport, its epicenter being in the arrivals area. Three terrorists opened fire to create panic in the street before two of them got inside the terminal building and blew themselves up. The third one detonated an explosive device at the entrance.
According to the latest official data, the bombing killed 41 and injured 239 people. Four Ukrainians suffered in the attack: one woman died later in hospital, three others received injuries of varying severity. Islamic State is reported to have assumed responsibility for the attack in the main Istanbul airport.
The attack on Europe's third-busiest airport was the deadliest in a series of suicide bombings in Turkey this year.
Related materials: Terrorist attack in Istanbul