Suspended constable Titu Chandra Das of Bandarbazar police outpost has been placed on a five-day remand in a case filed over the death of Raihan in custody.
Sylhe Additional Chief Metropolitan Magistrate Ziadur Rahman passed the remand order on Tuesday.
Members of Police Bureau of Investigation (PBI) arrested Titu from the Sylhet police lines around 2:30pm today.
This is the first arrest made by police after the death of Raihan Ahmed.
Later, investigation officer Mahidul Islam produced Titu before the court seeking seven days' remand for him.
Raihan Ahmed, 34, a resident of Akharia in Sylhet city, was beaten to death in police custody at Bandarbazar police outpost on October 11, his family alleged.
His body was exhumed for a second post-mortem examination and buried again on October 15.
The authorities on October 12 suspended four policemen, including the in-charge of Bandarbazar police outpost SI Akbar Hossain, in connection with the death.
PBI said it is looking for suspended SI Akbar and has written to the immigration police to prevent him from leaving the country.
Raihan's wife Tahmina Akter Tanni filed a case with Kotwali Police Station on October 12 accusing a number of unidentified people.
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