Turkish President Recep Tayyip Erdogan has repeated that the Islamic State group "most probably" was behind the Istanbul airport attack, adding that its militants would end up "in hell."

Speaking in Istanbul following Friday prayers, Erdogan said the extremist group claims to carry out acts in the name of Islam, but said it has nothing to do with the religion.

"They have no connection to Islam. Their place is in hell," he said.

"These people were innocent; they were children, women, elderly, ... They embarked on a journey unaware, and came face to face with death. You have no such right," Erdogan said.