Eight tourists were killed and five critically injured when a van from Kerala rolled down multiple hairpin bends on the ghat road here, police said on Friday.The vehicle lost control while proceeding along Valparai-Pollachi ghat road and rolled down from 13th bend to the ninth bend, said a police official.The vehicle was mangled in the impact.”There were 13 people on the van, they all came from Malappuram, but we are yet to establish if they all belong to a family or were friends or acquaintances,” he added.The injured were taken to the nearby hospital and are still in critical condition, a police source said.Further investigation is on.