Turkish authorities have identified a suspect over the suicide bombing close to Turkey's border with Syria that left 32 activists dead, Prime Minister Ahmet Davutoglu said on Tuesday.

"One suspect has been identified. All the (suspect's) links internationally and domestically are being investigated," he said in televised comments, adding there was a high probability the attack was caused by a suicide bomber with connections to Islamic State (IS) jihadists.

Davutoglu said that the death toll had risen to 32 from 31 and added that 29 victims were still hospitalised.