The all party meeting for the restoration of peace at Nandigram began on Thursday on a chaotic note with the BJP, which has not been invited, staging a black flag demonstration.
As participants at the meeting, convened by junior Left Front partner Forward Bloc's Secretary Ashok Ghosh, began arriving at Mahajati Sadan, the venue, BJP workers reached the spot and began demonstrating after blocking the arterial C R Avenue leading to chaos.
The police said that 30 BJP workers were arrested.
A strong police picket was also set up to ensure that the meeting could proceed undisturbed.
BJP sources said that another batch of party workers would demonstrate near the venue when the meeting ended.
Meanwhile, CPI(M) leaders, including Transport Minister Subhas Chakraborty, CITU state President Shyamal Chakraborty besides other Left Front participants joined the meeting.
Trinamool Congress chief Mamata Banerjee led an 8-member delegation, which included the leader of the opposition Partha Chattopadhyay.
Congress was represented by PCC Working President Pradip Bhattacharya and Somen Mitra.