Three quota protest organisers have been taken into custody for their own safety, said Home Minister Asaduzzaman Khan.
According to sources, Students Against Discrimination leader Nahid Islam and two other of the protest group were forcibly discharged from hospital Friday and taken away by a group of plainclothes detectives.
Nahid earlier this week told AFP he was being treated at the hospital in the capital Dhaka for injuries sustained during an earlier round of police detention.
Police had initially denied that Islam and his two colleagues were taken into custody Asaduzzaman Khan confirmed it to reporters late on Friday.
"They themselves were feeling insecure. They think that some people were threatening them," he said.
"That's why we think for their own security they needed to be interrogated to find out who was threatening them. After the interrogation, we will take the next course of action."
The home minister did not confirm whether the trio had been formally arrested.
Days of mayhem last week saw the torching of government buildings and police posts in Dhaka, and fierce street fights between protesters and riot police elsewhere in the country.
Prime Minister Sheikh Hasina's government deployed troops, instituted a nationwide internet blackout and imposed a curfew to restore order.
The unrest began when police and pro-government student groups attacked street rallies organised by Students Against Discrimination that had remained largely peaceful before last week.
Nahid, 26, the chief coordinator of Students Against Discrimination, told AFP from his hospital bed on Monday that he feared for his life.
He said that two days beforehand, a group of people identifying themselves as police detectives blindfolded and handcuffed him and took him to an unknown location to be tortured before he was released the next morning.
His colleague Asif Mahmud, also taken into custody at the hospital on Friday, told AFP earlier that he had also been detained by police and beaten at the height of last week's unrest.
