Trouble began after stones were pelted at Amit Shah's convoy as it passed through College Street and the arterial Bidhan Sarani on its way to Swami Vivekananda's residence in north Kolkata, a little over 3.5 km from Esplanade in the heart of the city, where it began.
A scuffle broke outside the Calcutta University campus on College Street, when student activists of both the Left and the TMCP shouted slogans against Shah, they said.
They showed black flags and waved posters with "Amit Shah go back" written on them.
The police controlled the scuffle.
A clash took place outside Vidyasagar college and university hostel when TMCP activists threw stones at Shah's convoy, the officials said.
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