A car bomb exploded Thursday at the entrance to a northern Syrian town controlled by Turkish forces and allied Syrian fighters, killing at least nine people, Turkish state media and Syrian rescuers said.The state-run Anadolu Agency said the bomb in a fuel truck exploded in Afrin, igniting a fire and causing considerable damage to the surrounding area. Syrian first responders, known as the White Helmets, said at least nine people were killed in the explosion, which occurred in a residential area, and 35 were wounded.The Britain-based Syrian Observatory for Human Rights put the death toll at 11 and said it was likely to rise because some of the injuries were serious. The Observatory said the blast occurred near a checkpoint at the entrance to the town where vehicles were lined up.Turkey and allied Syrian fighters took control of Afrin last year in a military operation that expelled local Kurdish fighters and displaced thousands of Kurdish residents. Ankara considers the Kurdish fighters who were in control of Afrin terrorists. Since then, there has been a series of attacks on Turkish targets in the area.Turkey supports the Syrian opposition in the war against President Bashar al-Assad but has joined with Russia to secure and monitor local ceasefires. Turkish troops have also crossed into Syria in recent years to battle Kurdish fighters and Islamic State in Iraq and Syria (ISIS) group militants operating along the border, setting up bases in the area.The civil war that has raged for eight years has killed more than 450,000 people and uprooted more than half of Syria's population. The Syrian government has regained control of more than 60 per cent of the territory once in the hands of armed groups and militants.In northwestern Syria, where the rebels have their last stronghold and where nearly three million civilians live, government forces have been pushing their way in to at least restore their access to a strategic highway in the area. Despite a Turkey and Russia-backed ceasefire, fighting has raged since late April, displacing hundreds of thousands and killing hundreds.On Thursday, the White Helmets said at least five people were killed in air raids on residential areas in the town of Jisr al-Shughur, southwest of Idlib. The Observatory put the death toll at three, with eight injured. The Observatory also reported that clashes between government forces and rebel fighters raged in the southern edge of the enclave, killing dozens from both sides.The government troops are fighting to regain control of a village they lost to the rebels earlier this week.