"We are concerned that the number of death will increase. The perpetrators will soon be found and put on trial," Turkey's interior minister said.
There is speculation that the blast was caused by an 18-year-old female suicide bomber from the Islamic State of Iraq and the Levant (ISIL).
The bomb was activated at the entrance to the Amara Culture Center in the city of Suruç in the southeastern province of Şanlıurfa's bordering with Syria.
At least 300 members of the Federation of Socialist Youth Associations (SGDF) were staying at the Amara Culture Center leading to most of the victims having been its members.
"It's hard to describe it in words. They urgently need donor blood," one of the witnesses of the explosion said.
It is reported that the video from the tragedy scene leaves no doubt that it was a planned explosion aimed at the largest possible number of victims.