ANKARA, Aug. 21 (Xinhua) -- The suicide bomber who carried out a deadly terror attack at a wedding in the southern Turkish city of Gaziantep on Saturday night is aged 12 to 14, President Recep Tayyip Erdogan said on Sunday.

The brutal terror attack was carried out by a teenager, and initial findings showed it was perpetrated by the Islamic State (IS) group, Erdogan told reporters in Istanbul.

He stressed that security forces have been conducting counter-terror operations against the IS, and are intensifying their fight against terrorists in Gaziantep province.

At least 51 people were killed in the attack, and 69 others injured, including 17 in critical condition, Erdogan confirmed.