KATHMANDU: One person has sustained critical injuries when three motorcycles collided with each other at Radhe Radhe of Bhaktapur, on Saturday. The injured has been identified as Nikesh Thapa (20) of Gundu in Bhaktapur district, informed police. Thapa was riding on the motorcycle (Ba 36 Pa 512) when two others (Ba 22 Pa 8120 and Ba 59 Pa 2266) collided. According to police, injured Thapa is being treated at the Madhyapur Hospital in Thimi. Police have arrested the motorcyclists and their impounded their respective vehicles for investigation.