The workers were constructing a toilet at a school next to the temple in Faridpur’s Madhukhali Upazila
Shamimur Rahman, 40, works as a teacher of a Qawmi madrasa and the khatib of a mosque.
The police’s Counterterrorism Unit arrested him at Firoz Shah on Tuesday following information given by Shakhawat Hossain Lalu, a suspected IT expert working for Ansar Al Islam who was arrested on Friday.
Members of Ansar Al Islam held meetings at Shamim’s home a number of times, the police said.
Shakhawat returned three months ago from Indonesia, where he was involved with Jihadist activities after fighting and taking training in Syria, according to the police.