New Delhi, July 29 - The Communist Party of India-Marxist (CPI-M) Wednesday demanding action against two union ministers of the Trinamool Congress because they 'violated collective responsibility' of the government by questioning the cabinet decision of sending paramilitary forces to West Bengal's troubled Lalgarh region.

'We are asking the central government to take necessary measures (against Minister of State for Rural Development Sisir Adhikari and Minister of State for Shipping Mukul Roy),' CPI-M politburo member Sitaram Yechury told reporters in parliament.

Yechury said the ministers had questioned the presence of paramilitary forces in the region where Maoists virtually established what they claimed was a 'free zone' since last November. 'This cannot be tolerated.'

The CPI-M leader said the two ministers had 'violated collective responsibility' on ministers as the decision to send the paramilitary forces was taken by the union cabinet.