The accident took place when a police van (Ba 1 Jha 7480) heading to Janakpur from Naktajhij knocked their motorbike (Ja 6 Pa 7339) coming from the opposite direction at the place.
The deceased are Rupesh Bhujel and Deepak Singh of Janakpur Municipality-14 who were riding on the same bike.
Similarly, the injured one is Bishal Koirala who is undergoing treatment at Biratnagar based Neuro Hospital, police said.
The cause behind the accident was over speed, police added.