The deceased have been identified as Vijay Sah, Sahdev Sah both from Dharmganj locality of the district and Ashok Yadav belonging to Islampur of West Bengal, police said.
The three were riding a motorcycle.
The incident occured when a speeding bus driver lost his control over the vehicle and hit the motorcycle the three were riding from behind killing them on the spot, the sources said.
Bodies have been sent to sadar hospital for post-mortem.