The dumper driver, instead of stopping the vehicle, kept on driving and one of the victims was dragged for a few metres by the vehicle on August 5, they said.
The deceased were identified as Sultanpuri residents Umesh and Sanjay. They were returning from Chhattarpur on a motorcycle when the accident occurred, the police said.
The driver fled the spot leaving the vehicle behind.
Before hitting the bikers, the dumper rammed into a cab injuring its driver, the police said.
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When they reached near Nanda Hospital crossing, they were hit by a speeding dumper that had also hit a cab earlier.
The injured cab driver, Shameem (40), told police that he was on his way to drop a passenger. The dumper driver first hit his cab, that hit the divider. The driver kept on driving and hit a motorcycle carrying two men, who were dragged by the dumper for a distance.
After a while, the dumper driver stopped and fled from the vehicle.