The condition of senior Communist Party of India (Marxist) leader Anil Biswas remained critical On Sunday after he was operated upon following a cerebral attack on Saturday evening.

Biswas, a politburo member of the left party, was under constant observation, doctors attending on him said on Sunday. Biswas, the secretary of CPI(M) West Bengal unit, was rushed to a private nursing home around 9 pm on Saturday night after he suffered brain haemorrhage at home.

The CPI(M) convened an urgent meeting on Sunday morning, cancelling all its poll-related programmes to take stock of the situation, party sources said.

Nursing home authorities in a statement said that a medical board has been constituted for the treatment of Anil Biswas who is now in the ICCU. Dr R N Roy heads the seven-member board.   

The statement, issued by nursing home's Chief Executive Officer Sumedha Sen, said Biswas had been admitted with a massive brain haemorrhage and subsequently underwent an emergency brain operation to remove the clot. He has been kept on a 'life care support system' from the time of admission.

The board members reviewed his condition during the day and recommended a CT scan, which was subsequently done. His condition remained critical but stable, the statement said.

According to informed sources, CPI(M) politburo members Sitaram Yechuri and Brinda Karat would be arriving later in the day to visit the ailing leader. Chief Minister Buddahadev Bhattacharjee, who was scheduled to start campaigning for next month's assembly election at a public meeting on Sunday, has also cancelled the programme and rushed to the party office.