Patna: JNUSU president Kanhaiya Kumar was today shown black flags at a function here by two unidentified persons who were roughed up by his supporters before being detained by the police for questioning.

The two persons belonging to a little-known outfit -'Youth Swaraj' - showed black flags to the JNUSU president, besides raising slogan of 'Bharat Mata Ki Jai' while he was speaking at a function 'Azadi' in S K Memorial hall here organised by AISF and AIYF.