President Tayyip Erdogan blamed the murders on Islamic State and said the killer, who wore an explosive belt, was between the ages of 12 and 14.
The sickening attack is the deadliest bombing this year in Turkey, which faces threats from militants at home and across the border with neighbouring Syria.
The country’s President Tayyip Erdogan said militants had carried out the late-night attack Gaziantep on Saturday.
The local governor’s office said in a statement 50 people were killed in the bombing, and more wounded were still being treated in hospitals around the province.
“The celebrations were coming to an end and there was a big explosion among people dancing,” said 25-year-old Veli Can.
Horrified witnesses to the attack in Gaziantep on Saturday said there was “blood and body parts everywhere”