KATHMANDU: Police on Monday arrested a youth in possession of 639 ampoules of various controlled drugs from Chabahil of Kathmandu. The 26-year-old Bikram Rai, a permanent resident of Patlepani-3 of Bhojpur district, was arrested from nearby the Sagarmatha Guest House at around 7 pm yesterday. A team deployed from the Narcotics Control Bureau of Nepal Police also impounded a Pulsar motorbike (Ko 28 Pa 6521) he was riding on. Further investigation is underway.