Parts of Kolkata plunged into a welter of violence as the BJP president Amit Shah's convoy was attacked with stones by alleged TMC supporters from inside the hostel of Vidyasagar College, triggering a clash between supporters of the two parties, officials said.

Condemning the desecration of polymath Ishwar Chandra Vidyasagar's statue in a college in Kolkata, the CPI(M) on Tuesday alleged "attacking knowledge" was central to the BJP's "poisonous project".