Doctor Shakir Bin Wali, who had been missing since Sunday, was shown arrested on Wednesday in connection with his alleged link with the banned militant group -- Ansar al Islam.
He was involved in motivating young people, including school and college going boys, to accept extremism, police said.
Shakir used to recruit members for the militant outfit from different parts of the country, organise military training and help the alleged pilgrimages.
The doctor was produced before the court with a 10-day remand on Wednesday, confirmed sources at the Counter Terrorism and Transnational Crime (CTTC) Unit of Dhaka Metropolitan Police.
Earlier, CTTC Inspector Kazi Mizanur Rahman filed a case with Rampura Police Station against one Abrarul Haque and Shakir under the Anti-Terrorism Act, where he claimed that the duo are involved in terrorist activities and affiliated with the banned militant outfit Ansar al Islam.
Mizanur, in the case statement, mentioned that a team of CTTC first arrested Abrarul Haque, 18, from Moghbazar area around 2:00pm on Tuesday. Based on his information, they later arrested Shakir from in front of his Hajipara house around 5:00pm the same day.
In the case document, it was alleged that Shakir and his aid Abrarul were involved in the recent disappearance of seven boys, all students of SSC and HSC levels, who left home for ‘hijrat’ (pilgrimage).
The individuals, who knew each other, did not take any clothes or phones, according to the general diaries filed by their parents with Kotwali Model Police Station. Shakir has trained the youths for the so-called jihad, CTTC official Mizanur said. However, during a press briefing at the Crime Reporters' Association of Bangladesh at Segun Bagicha on Wednesday, Shakir's father AKM Wali Ullah said that all the claims of the police are ‘made up, untrue and imaginary’.
He said that four men identifying themselves as Criminal Investigation Department (CID) officials picked up his son from their house on Sunday. "We will take legal action for detaining Shakir illegally for four days," he added.