Twenty one Youth Congress activists were arrested here on Sunday as they gathered to stage a black flag demonstration against Prime Minister Narendra Modi - on a brief visit to the city - in protest against the Jawaharlal Nehru University row.
"The activists had gathered on Strand Road close to the programme venue Netaji Indoor stadium. However, they were arrested before the prime minister's convoy passed the area," said a police officer.
The 21 arrested youth Congress workers were released after some time.
Modi had visited the city for a couple of hours in the evening to attend the inaugural function of the Sri Gaudiya Math & Mission's centenary celebration.