Yadadri Bhuvanagiri, March 6 : Three people were killed on the spot and several others injured when a Telangana State Road Transport Corporation (TSRTC) bus hit them after collision with a tractor at Manthapuri Bypass, Alair Mandal in this district on Sunday. The accident occurred when the TSRTC bus was proceeding to Hyderabad from Warangal, police said. The victims were daily labourers hailing from Rayagiri in Bhuvanagiri Mandal. They were participating in Highway road work at the time of the accident. The injured were admitted to Government Hospital Alair for treatment. A case has been registered and an investigation is underway, police added. VV RKM