
The deceased was identified as Matiur Rahman, 35, son of Unsar Ali of Shibganj upazila.
RAB arrested some people, including Matiur, on Thursday night for their alleged involvement in subversive activities, including arson.
According to his statement, elite force conducted a drive in the area at night.
Sensing the presence of RAB, the associates of Matiur blasted cocktails and opened fire. Later, police also fire back to protect them.
"Matiur was caught in the line of fire and died there" officer-in-charge Mainul Islam of Shinganj Police Station said.
RAB suspect Matiur as the arsonist and an activist of Jamaat-e-Islami.
Shibganj upazila Chhatra Dal General Secretary Abdullah Al Faruk claimed Matiur to be the assistant president of the party's Shyampur unit.
Police recovered a pistol, a revolver, two LGs, two shooter guns, five bullets, three magazines, 17 crude bombs, 10 petrol bombs and five local weapons from the spot.
TF