The Farmer Martyrs’ Day — or Nandigram Day — should be observed nationally, Mamata told reporters at a hurriedly-called press conference at her Kalighat residence.

Mamata, however, did not specify the programme for the day.

She termed Bhattacharjee’s visit to Nandigram as an eyewash.

“The land that he has distributed will be grabbed by the government some day for chemical hub,” Mamata said, referring to the 10,000-acre special economic zone for chemical industries that had been planned at Nandigram before the people’s violent resistance since January 2007 forced the government to drop the idea.

Trinamool sources said Mamata has given orders to her party to observe the martyrs’ day on a large scale.