Prime Minister Manmohan Singh [Images] has expressed concern over the recent violence in Nandigram and asked Union Home minister Shivraj Patil to look into it urgently.

In a letter to the Leader of the Opposition in the West Bengal Assembly, Partha Chatterjee, Dr Singh said, "I have seen your letter of October 28, 2007 regarding the recent incidents in Nandigram. I am concerned about the developments there and I have spoken to the Home Minister to look into these urgently."

Singh, however, did not speak about the deployment of Central Reserve Police Force personnel at Nandigram as sought by the West Bengal government.

Chatterjee, who is also the General Secretary of the Trinamool Congress, said that he received the letter on Tuesday. He said that in his letter to Dr Singh, he requested that to restore peace, the border between Khejuri and Nandigram must be declared a disturbed area and CRPF personnel deployed under central supervision.

He had also called for the sacking of Chief Minister Buddhadeb Bhattacherjee for state-sponsored terrorism.

Singh had written a similar letter to the leader of the Party for Democratic Socialism Saifuddin Chowdhury, an ally of the TC in the anti-land land acquisition movement.