Terming the developments in West Bengal a cause of concern for all citizens regardless of their political affiliation, Samajwadi Party chief Akhilesh Yadav Tuesday wrote an open letter to the people urging them "protect and preserve" constitutional values and the institutions charged with upholding them.

In an unprecedented development on Sunday, a number of CBI officers, who had gone to question Kolkata Police Commissioner Rajeev Kumar in connection with chit fund scam cases, were bundled into police jeeps, whisked to a police station and briefly detained.

Hours after the incident, West Bengal chief minister Mamata Banerjee began a sit-in right in front of the Metro Cinema to protest "insults" she faced at the hands of Prime Minister Narendra Modi and BJP chief Amit Shah and claimed the CBI knocked on the doors of Kumar without a search warrant.

The Samajwadi party chief, in the letter released here, said, "The attack on the state of West Bengal is not only an attack on the values and tenets of the Constitution but also an attack on the dreams of our founding fathers."

He said that the attack on West Bengal is also an attack on the dreams of the founders of our nation. These founders were against the Sangh Parivar until their lifetime. In the tenure of the BJP government, the dreams of the common man are being wired. Policies are being made in the interest of industrialists who fund the BJP.

Akhilesh said that Prime Minister Narendra Modi is a very weak person. His colleague in the Cabinet, Nitin Gadkari is also saying, what the country will handle, who can not handle his house. These people are also attacking Mamta Banerjee.