Three members of the banned group the Ansarullah Bangla Team arrested over murders of Avijit Roy and Ananta Bijoy Das.
More than 30,000 Indians live in small enclaves landlocked within Bangladeshi borders.
For nearly 70 years, there has been no police presence there because of a bizarre border arrangement. Consequently, many murders and other criminal cases remain unresolved.
Al Jazeera’s Maher Sattar reports from Dashiar Chara, Bangladesh.