On the other hand, the police invoked milder charges against those who lynched Debashis Acharya, who was admitted to a state-run hospital in a serious condition.
Acharya (23) was arrested today after a case under 120B, 307, 323, 343, 447 and 506 of the IPC was registered against him for attacking the MP.
The Akhil Bharatiya Vidyarthi Parishad (ABVP), meanwhile, denied that the youth who attacked Banerjee was a member of the organisation.
"Besides, the 23-year-old youth, a resident of Tamluk in East Midnapore district, has close link with a right-wing political organisation," Sharma said.
The IGP said that three cases were registered today in connection with the attack on the TMC MP.
The first case has been registered against Acharya for assault on the MP under IPC 120B (Criminal Conspiracy), 307 (attempt to murder), 323 (voluntary causing hurt), 343 (wrongful confinement) , 447 (criminal trespass) and 506 (criminal intimidation).
Acharya was chargesheeted in a case of attack on a first year student of Berachampa Acharya J C Bose Polytechnique College in 2012 in North 24-Parganas district, he said.
The youth was also present in a conference of the ABVP recently, which was organised at Srirupa cinema hall at Contai, the IGP said.
A leaflet recovered by the police also disclosed that Acharya had attended a programme of the ABVP at Suri in Birbhum district as East Midnapore district president of the organisation recently, Sharma said adding that Acharya's father also admitted to this.
Meanwhile, three of Acharya's companions - Tamal Pallab, Sukhen Das and Surajit Bera - who were detained for questioning were allowed later to leave, East Midnapore district SP Sukesh Jain said.
The three were stated to have accompanied Acharya at the rally.
The family members of Acharya were unavailable in their home at Tamluk when visiting nesmen found it bolted from outside.
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