The Kolkata Police on Wednesday said a person has been arrested in connection to the death of a 22-year-old leader of Communist Party of India-Marxist (CPI-M) student wing Students' Federation of India (SFI) in the city.
The arrested person was identified as Raju Das.
Das was the driver of the bus that was used to take the agitators to the prison, the police said.
SFI leader Sudipto Gupta died during a police action in Kolkata at their law violation protest on Tuesday.
Reacting to the death of the SFI leader, West Bengal Chief Minister Mamata Banerjee told reporters on Wednesday: "Every death is unfortunate."
Meanwhile, protesting against the death of Gupta, the SFI has called a state-wide strike in West Bengal on Thursday.
The autopsy report of Gupta is expected on Wednesday.
The police said Gupta died after he was hit by a lamp post while alighting from the police van in which he and other protesters were being taken away after arrest.
The students had alleged that he was beaten up severely by police and pushed and even after he was taken to the SSKM Hospital he was left unattended. The students, including girls, said they were roughed up and ill-treated even inside the vehicle.
SFI General Secretary Satarup Ghosh told CNN-IBN: "He was hit on his head so hard that one of his eyes came out."
"We were courting arrest when the policemen started beating us in the bus. One of the policemen hit Sudipto´s head with a lathi and he fell down. When we demanded immediate medical help for him, the police refused," he said.
Speaking on Gupta´s death, Joint Commissioner of Police Jawed Shamim said: "There was a dispute in the bus. He was an ex student of Netaji Nagar College in Kolkata. Sudipto Gupta was hit by a lamp post and he fell unfortunately."
Gupta was an M.A student from Rabindra Bharati University.
The SFI was holding a protest in demand of student elections in the city´s downtown area at Esplanade on Rani Rashmoni Road.
Soon there were commotion and a police action led to the clashes.
Several others were also injured in the police action and the clashes.