Three persons were killed in Uttarakhand's Dehradun district when a vehicle fell into a deep gorge in Khadamba, police said on Tuesday.The loader vehicle belonging to the Uttarakhand Fort Department was transporting wood from Jaunsar-Baawar to Chakrata when the accident happened late on Monday.The deceased included the driver.The bodies were recovered early on Tuesday and the families informed, a police official told IANS.