At least eight Buddhist monks were killed and 14 others injured when a pickup truck struck a group of pilgrims in northeastern Thailand on Thursday. The accident occurred in Mukdahan province, about 600 kilometers northeast of Bangkok, as 35 monks were walking toward Ubon Ratchathani province on a 260-kilometer pilgrimage. Five monks died at the scene, and three more succumbed to injuries in hospital, according to Mukdahan governor Warayan Bunnarath.

Security footage released by the Ruam Jai Mukdahan Rescue Association showed the monks walking in a line along the roadside when the pickup lost control and veered into them. Police said the vehicle was being driven by an 11-year-old boy, who has been taken into custody. Child protection officials are expected to question him once they arrive.

Authorities said the cause of the crash remains under investigation. Some monks reported seeing the truck swerving before it left the road and hit them.