The on-duty doctor who was allegedly arrested for sporting a T-shirt and badge in solidarity with the RG Kar protests at the West Bengal government’s Durga Puja Carnival said that he wasn’t told the reason for his arrest.

“For over three hours inside the police station, before I signed the bail bond, I kept asking what my fault was,” Tapabrata Roy, who was arrested Tuesday but released four hours later, told The Indian Express. “Officials said they didn’t know the reason,” he said.

Roy, was on emergency duty as part of the Kolkata Municipal Corporation’s medical team, was arrested after he was seen sporting a T-Shirt that said, “Spine is not for sale” and a badge with the words ‘Pratiki Anashankari’ (observer of symbolic hunger strike), both referring to the doctors’ protests and hunger strike in the aftermath the rape and murder of a junior doctor at the RG Kar Medical College and Hospital in August.

Roy’s arrest drew protests from fellow doctors, who held a demonstration outside the Maidan police station where he was being held.

Roy claimed that a senior police officer had told him that he could be “under attack” before detaining him. It’s as yet unclear what this means.

“Strangely, later they arrested me,” he claimed, adding that he would seek legal help to challenge the arrest.

The Kolkata Police are yet to issue any statement on Roy’s arrest. However, doctors employed with the Kolkata Municipal Corporation have given the police 48 hours to tender an apology.

The medics registered their protest during a meeting with the civic body’s health department Wednesday.

Meanwhile, junior doctors protesting for better work conditions launched a “public signature collection” Thursday to strengthen their case. The campaign was started from the hunger strike stage at Dharmatala.