The Saturday night terror attack was carried out by a teenager, and initial findings showed it was perpetrated by the Islamic State militant group, Xinhua news agency quoted Erdogan as saying in Istanbul.
He said security forces were conducting counter-terrorism operations against the IS group, and were intensifying their fight against terrorists in Gaziantep.
At least 51 people were killed and more than 69 injured in the attack.
As many as 17 persons were in critical condition, Erdogan confirmed.
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