The incident occurred late last night when a speeding tractor hit a motorcycle on which Dharmendra (45) and his son Krishna (5) were riding and another motorcycle on which a youth and a 10-year-old boy were travelling, they said.
Police said the victims died on the spot while the tractor driver is absconding.
Efforts are on to identify the remaining two riders and the bodies have been sent for postmortem, they said.