"This is a fascist surgical strike. We have never seen anything like this before. Everywhere this is going on, be it Lucknow, or Moradabad. They are doing whatever they feel like," she said.
The Chief Minister said the way students and professors were tortured was "very disturbing".
"It is very disturbing, not only for me, but for all. I feel ashamed at the way democracy has come under vicious attack," she said.
She appealed to the student community to join forces.
"I appeal to the student community to come together. Let us jointly fight against this government," Banerjee, who was baptised into politics through student movements, told media persons in Kolkata.
Condemning the violence let loose on the students of the Jawaharlal Nehru University, she accused the BJP of sending "miscreants" and then asking the police to stay inactive.
"They sent the BJP goondas (hoodlums). The police were made inactive. What can the police do? They got instructions from higher ups not to take any action, but remain silent spectators while the BJP got active. This is absolutely wrong," she said.
The Chief Minister said in a democracy, governments will come and go. "But nobody has the right to run amok just because they have the majority. Whatever functions I perform, they have to be as per constitutional stipulations."
"I feel ashamed at the way democracy has come under vicious attack. If anybody speaks out, he is dubbed a Pakistani. If anybody speaks out against some persons in power, he is dubbed an enemy of the nation.
"This has never happened in India in the past. But the difference between India and Pakistan is that Pakistan is not a democratic country. On the other hand, we feel proud that India is a democratic country," she added.
Later, interacting with media persons at the Ganga Sagar island, Banerjee said: "It is totally a pre-planned attack."
"Why did the outsiders along with all the hooligans and all the arms go there? They beat up the students and teachers mercilessly."
Banerjee alleged that through the administration officials were present there, nobody rescued the students who were victims of the violence.
"Democracy is in danger. The impartiality of institutions is in danger. Freedom of expression is in danger," she said.
( With inputs from IANS )