Over 2000 police personnel have been deployed in Central Kolkata.
The rally was heading towards Nabanna to protest against a slew of issues, including farmers' distress, unemployment in the state and maintaining communal harmony.
Protestors went berserk and pelted stones at the police officers.
Left party sources on the other hand said many of their leaders including former state minister Kanti Ganguly, Foward Bloc leader Naren Chatterjee and hundreds of workers were injured when the police resorted to the "unprovoked batoncharge". These places are Rani Rashmoni Avenue at the heart of the city, Kidderpore in south Kolkata, Police Training School near the race course, Santragachhi on Kona Expressway and Howrah Rail Museum near Howrah station. "This is undemocratic. Nobody was carrying arms or bombs that the police attacked them", Mr. Mannan said. At a press conference later, Supratim Sarkar, additional commissioner of police (III) regretted the assault on scribes and said the incident will be investigated.
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They also demanded that democratic rights of people in the state must be maintained.
Police, using water canons and and lobbing tear gas shells, managed to temporarily disperse the Left workers, but they soon regrouped and confronted police again, shouting "Inquilab Zindabad" and holding aloft the red flags. Police, however, said they were ready to tackle the challenge.
However, there was high drama even before the scheduled start of the march, as a number of Left Front lawmakers including its legislature party leader Sujan Chakraborty reached Nabanna around noon and shouted slogans at its gate, demanding they be allowed in.
Another top CPM leader Biman Basu, who was injured on the head during the agitation, demanded the immediate release of the arrested CPM MLAs. Some medical camps opened by the Left were allegedly vandalised by the police.
Banerjee was not at Nabanna during the protest march as she was hosting an administrative review meeting in Birbhum district. "We have directed our comrades to be prepared for any situation", CPI-M state secretary Surya Kanta Mishra had told mediapersons.