A Chechen extremist masterminded the triple suicide bombing at Istanbul's busiest airport that killed at least 44 people, a U.S. congressman said. Thirteen people suspected of possible links to the attack were detained in raids in three Istanbul neighborhoods on Thursday, officials said. Although no one has claimed responsibility for the attack, the Islamic State group is suspected, and Turkish President Recep Tayyip Erdogan repeated Friday that IS was "most probably" behind it. An official said Friday that security forces have killed the mastermind of the Feb. 17 attack. The attack against military personnel was claimed by an offshoot of the Kurdistan Worker's Party, or PKK, which Turkey considers a terrorist organization.

Source: ABC News July 01, 2016 06:56 UTC