Two bikers, identified as Prabhash Kumar and Vibhash Kumar, were killed on the spot after a speeding unidentified vehicle rammed into their motorcycle near Pathraha village under Madhepura police station area, the sources said.
The deceased were brothers, they said, adding the bodies have been sent for post-mortem.
In another incident, 10 members of a marriage party were injured as a Tata magic minibus in which they were travelling collided with a passenger bus near Toka village under Ghabhawaria police station area, they said.
The injured were admitted to a government hospital for treatment, the sources said.