It was not yet clear whether the police was referring to explosives ready for use or material used for making them.
Dhaka Metropolitan Police (DMP) spokesperson Muntasirul Islam told bdnews24.com that three people were arrested from Dhaka’s Lalbagh on Sunday night with 2 kg of ‘explosive materials’.
He, however, did not say whether the four held were linked to any militant group, but said details will be provided in a media briefing later in the day.
Police have recently arrested 12 al Qaeda in Indian Subconrtinent (AQIS) activists including their chief coordinator in Bangladesh Mawlana Mainul Islam and one of his top advisor.
Mainul is a former HuJI leader.
Police said the AQIS were preparing for a big violent action in Dhaka after interrogating Mainul Islam.