Four persons were killed when a tractor fell into an open well in Telangana's Karimnagar district on Saturday, police said.The incident occurred in the early hours of the day near Doddanapalli in Saidapur Mandal of Karimnagar district.According to police, the tractor lost control after hitting a two-wheeler and fell into a roadside irrigation well. Two persons on the motorbike were injured in the accident.The rescue workers had a tough time in removing the tractor and retrieving the bodies from the well.Finance Minister E. Rajender visited the scene and consoled the families of the victims.