Metropolitan Magistrate Mohammad Asaduzzaman Noor passed the order after DB Inspector Md Fazlur Rahman, also the investigation officer of the case, produced the trio before it seeking a 10-day fresh remand for interrogation.
The remanded accused are Mohammad Touhidur Rahman alias Gama, Md Sadek Ali Mithu, and Aminul Islam Mollik. Of them, Touhidur is a Bangladeshi-born UK citizen and IT expert.
The court also rejected their bail petitions submitted by defence counsels.
They were earlier remanded for three days on the same charge.
Elite force Rapid Action Battalion
(RAB) tossed in the slammerYou have the right to remain silent...
them in connection with the cases filed over the murders of Avijit and another Mukto-Mona blog writer Ananta Bijoy Das from the capital's Nilkhet and Dhanmondi areas on August 18.
After the arrests, RAB personnel at a press briefing told news hounds that Touhidur and Sadek had confessed to planning murder of both the bloggers.
They are followers of Ansarullah chief Jasim Uddin Rahmani, now undergoing trial for instigating militancy and the murder of another secular activist Ahmed Rajeeb Haider.
Touhidur closely followed Avijit and Ananta before the killings, RAB claims. Moreover, the duo said that five members of the murderous Moslem organization had taken part in the murder incidents.
Founder of Mukto-Mona blog Avijit was killed and his wife Rafida Ahmed Bonna critically injured when some youths attacked them with machetes near TSC intersection on Dhaka University campus on February 26. The couple, both US citizens, came to Bangladesh to attend Amar Ekushey Book Fair.
On the other hand, rationalist writer and banker by profession Ananta was hacked to death near his house in Subidbazar Bankalapara area of Sylhet city on May 12.