GAIGHAT: Three persons were killed and three injured when a tractor met with an accident at Deurali of Udaypur district Saturday night. Those killed were passengers Sumitra Pokhrel of Rampur and Nir Bahadur Karki and driver Shambhu Sada, the DPO Udaypur said. Jaya Karki, Khem Karki and Tilak Bahadur Karki were injured in the accident. They are undergoing treatment in BPKIHS, Dharan.