"He tried to disturb the meeting in Belpahari, which is the highest Maoist-prone area. He broke the barricade in the z-plus security zone. He was drunk and pushed police officers and women and used threatening language," Roy told PTI.
"Anyone has a right to ask questions. But he did not ask any question. He was just shouting. I was present there," Roy said.
The Railway minister said that the man also resisted his detention and also did not give his identity correctly.
"He said his name was Durjodhon Mahato. But later it was found during investigation by the police that his name was Siladitya Chowdhury. Why did he not give his name correctly?" he asked.
Roy, stopping short of calling the man a Maoist, said "He is a criminal trespasser. He had criminal intentions. He is among those who are bent on creating trouble and does not believe in parliamentary democracy."
He also said that none had objected when the man was detained.
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Trinamool Congress MP, Derek O' Brien, said that there was no instruction to the police from the CM's office to arrest the man. "The police are doing its duty and the law will take its own course.
"In this highly sensitive Maoist zone, security was keeping a close watch on the crowd when they noticed the man along with six or seven others continuously heckling the CM and also preventing them from discharging their duties and attempting to disturb the peace at the rally," O'Brien said.
He said that the man was detained, questioned and allowed to go, but on Saturday afternoon after further investigation, he was arrested.