The incident took place a day after police yesterday arrested 26-year-old Mohammad Javed and four other JMB members in the southeastern port city of Chittagong, amid an intensified anti-militancy security campaign.
Police also seized a cache of weapons from their hideout.
"After a night long interrogation Javed led a police team to a house saying they have stored some weapons there. As our detectives entered the house, Javed exploded a grenade," Chittagong ACP Babul Akhter said.
The explosion killed Javed while two police detectives were wounded, the official said.
The development came as the authorities intensified an anti-militancy campaign following last week's murders of an Italian and a Japanese national, claimed by the dreaded ISIS terror group.
Officials and security experts earlier said years of massive anti-militancy campaign exposed the militant outfits to a dilapidated state despite their efforts to regroup.


Latest News from World News Desk