Three persons were killed and one critically injured when a truck fell into a gorge in Tehri district of Uttarakhand on Monday, police said.The incident took place on the Chamba Koti Colony road near Gajda village, when the truck was going to Rishikesh from Lambgaon.All the persons involved in the accident were from Pratap Nagar in Tehri.The people in the area along with the police rescued the injured and pulled out the bodies from the gorge.The dead have been identified as Sohan Singh, 29, Kanhaiyya Singh, 28, and the driver Ummaid Singh, 42.The injured, Sandeep Bisht, has been admitted to a hospital in Chamba.