Demanding an end to the black-marketing and ensuring smooth supply of the petroleum products, three Student Unions including UCPN (Maoist) affiliated All Nepal National Independent Student Union(Revolutionary) (ANNI SU-R) have staged a sit-in in front of the campuses in the capital on Sunday morning. According to Surendra Paudel, ANNI SU-R Spokesperson, they stage a nationwide hour-long chakka jam in front of main campuses including in the capital-based Ratna Rajya Laxmi, Pashupati Campus, Amrit Science Campus, Pulchowk Engineering Campus, Nepal Commerce Campus and Bhaktapur Campus from 9 to 10 am today. Due to the sit-in, the traffic management in the capital was disrupted.