Daesh (also known as ISIL or the Islamic State terrorist group) claimed responsibility for the attack.
"The incident took place hours after Islamic State [Daesh] militants took up positions at the entry to the municipality. They set up check points near a hotel and searched cars entering [the premises]," the security forces source said.
According to the source, the explosion could have been triggered by a bomb implanted inside the governor’s car. Other media reports suggested that the blast had been caused by a rocket propelled grenade or a suicide bomber.