Censor.NET reports citing the president's Twitter.
"I condemn the terrorist attack in Kayseri. Condolences go to the families of victims. We stand by Turkey. Terrorism is unjustifiable," Poroshenko wrote.
It was reported earlier today that 13 soldiers were killed and 48 more injured when a car exploded near a bus transporting off-duty military personnel in the central Turkish city of Kayseri. The bus was stopped at a red light near the campus of Erciyes University in Kayseri when a car approached it and detonated.