Police arrested two businessmen from Gudri Bazar of Biratnagar on Sunday on the charge of black marketing of onion. Police arrested them after they were found selling onion they bought at rupees 47 per kilo at rupees 100. There is a scarcity of onion in Nepal following India's export ban on onion. The arrested have been identified as 38-year-old Sanjaya Kumar Gupta of Biratnagar Metropolitan city-9 and 29-year-old Mukesh Kumar Sahani.