Metropolitan Magistrate Court- 4 Judge Tamanna Farah passed the order while investigation officer Senior ASPolice Khairul Islam of Rapid Action Battalion (Rab) sought seven day remand for each accused to interrogate them.
All the accused were present on the dock.
The accused are former Officer-in-Charge of Teknaf Police Station Pradeep Kumar Das and former Inspector Liakat Ali, ex-Sub-Inspector Nandadulal Rakshit, ex-Assistant Sub-Inspector Liton Mia, constables Safanur Karim, Kamal Hossain, Abdullah Al Mamun.
Also read: Major Sinha murder: OC Pradeep, Inspector Liakat on 7-day remand
Earlier on August 6, three key accused Pradeep, Liakat including of the case were placed on seven-day remand which concluded on Monday.
The authorities on August 2, suspended 21 police officials, including the in-charge of Baharchhara police outpost, in connection with the killing.
Also read: Sinha murder: 3 APBn members put on 7-day remand
Major (retd) Sinha was killed in police firing at Baharchhara police check-post on July 31.
Sharmin Shahriar Ferdous, elder sister of Sinha, filed the case at Teknaf Senior Judicial Magistrate Court on August 5.
Also read: Major (retd) Sinha: Rab simulates killing incident with Pradeep, Liakat