They were arrested on Wednesday from a house in Dhaka’s Goran neighbourhood for allegedly plotting subversion.
Police wanted to have them in remand for five days but Metropolitan Magistrate Ataul Haque sent them to jail on Thursday, rejecting both the police plea and the defence lawyer’s bail appeal.
Police had said the detainees were extremist members of the Islami Chhatri Sangstha, female wing of Jamaat-e-Islami’s student front Islami Chhatra Shibir.
All of them, aged between 22 and 24 years, were students of various colleges and universities, police said.
Acting on a tip-off, police had arrested them on Wednesday night for, the law enforcers said, plotting ways to thwart the trials of the 1971 war criminals.
The Chhatri Sangstha members had threatened burst bombs and hurled abuses while they were being arrested.
Laptops, a projector, leaflets and several books including some by Jamaat guru Ghulam Azam and the party’s founder Syed Abul A'la Maududi were also found on them.