The court of Metropolitan Magistrate Nazmul Hossen sent them to jail rejecting their bail petitions after they were produced before the court on Sunday.
The case was filed under the Anti-Terrorism Act with Double Mooring police station.
Of the detainees, seven pleaded for bail to the court, CMP Assistant Commissioner (prosecution) Kazi Shahbuddin told the Dhaka Tribune.
Acting on information, a team of police held three Tahrir members from Jhorna Para area while holding a clandestine meeting on Saturday night, CMP Additional Deputy Commissioner (west) Nazmul Hasan told the Dhaka Tribune.
“Based on their confession, police conducted drives in Halishahar, Nayabazar-Eidgaon, Double-mooring and Khulshi areas, and arrested the rest of the suspected Tahrir militants,” Nazmul added.
Most of them were previously involved with Jamaat’s student wing Islami Chhatra Shibir and later joined Hizb ut-Tahrir. During the investigation, police found that they were in the primary stage of radicalisation.
Police were investigating the matter and trying to find out their leaders, officials said.
A section of Jamaat-Shibir men had joined local militant groups including Hizb ut-Tahrir and were working in concert to build a greater network with a view to waging an armed jihad from Chittagong, police said.
On August 1 last year, police arrested five leaders of banned outfit Ansarullah Bangla Team from the city’s Katgarh area. Police later identified them as former Shibir men.
Detectives claimed that the anti-liberation forces were patronising the militants, and opted for news names and techniques to avoid arrest and harsh punishment.