A Tunisian town has buried a military doctor killed in this week's attack on Istanbul airport as he tried to extract his son from the grasp of the Islamic State group.
Unconfirmed details about the attack flooded Turkish media.
While Chayatev's whereabouts are unknown, his ties to jihadist activities are well documented, McCaul said. McCaul says Chatayev's whereabouts are unclear but he is known to have served as a top lieutenant in the Islamic State's war ministry.
Turkey has arrested three more suspects in connection with the June 28 terrorist attacks at the Istanbul Ataturk Airport. Two of the men targeted the global terminal building, and the third one gunned down people at the parking lot.
According to Turkish authorities, the three suspected Daesh assailants were from Russia, Uzbekistan and Kyrgyzstan.
Swedish authorities said Chatayev was convicted of weapons smuggling in 2008.
The suspected suicide bombers were Russian, Uzbek and Kyrgyz nationals, a Turkish government official said yesterday.
Turkish officials did not confirm to Reuters that Chatayev was part of the investigation.
Chechnya has produced many fighters following the 1990s wars that pitted Russian forces against Chechen separatists.
The U.N. Security Council condemned the attack, saying that any acts of terrorism are criminal and unjustifiable and are "one of the most serious threats to global peace and security". These are basically Russian Muslims from the North Caucasus and the Volga region, with the majority of Russians who leave to fight in Syria for ISIS hailing from Dagestan.
TWITTER EXPLOSION The moment on of the terrorists detonated their bomb
CIA Director John Brennan said the attack "bears the hallmarks" of ISIS' "depravity".
The Turkish authorities presume that ISIS organized the attack, stating that all evidence points to the terrorist organization.
It was at one of these exits that an attacker was able to penetrate the building before blowing himself up, according to several witnesses. One man, the owner of the Bekir Yar Emlak real estate agency, said he told police that the picture showed the men who had lived in his apartment.
Turkey sees the YPG as a branch of the PKK, a group of Kurdish rebels that for decades has carried out bloody terror attacks in Turkey in a bid for an independent state for Turkey's Kurdish minority.
Government sources say that the attack was "extremely well planned with ISIS leadership involved". "These were the guys who were essentially on the front lines guarding Falluja, the city they just lost in Iraq".
"It was God that saved me", said the man in his thirties. A second attacker exploded a bomb minutes later in the departures area upstairs. All three of them blew themselves up. "So in a sense, the ultimate Kamikaze warrior", said Weiss.
Turkey's main opposition leader, Kemal Kilicdaroglu, angered by the ruling AK Party's (AKP) refusal to hold an inquiry into the airport attack, accused the AKP of "an ideological kinship" with ISIS.
Recent bloody attacks on Istanbul Ataturk Airport brought the issue of security measures provision to the forefront. At least 10 people died in those blasts.
Those killed at the Istanbul airport had come from all over the world, but a lot of them were Turkish, including 10 airport employees, TAV Airports CEO Sani Sener said.
Insecurity has already taken a heavy toll on Turkish tourism, with the number of foreign visitors falling by more than third in May, the biggest drop in at least 22 years.