A suspected member of Neo JMB was killed in self decorated explosion in a hotel of Panthapath area in the capital on Tuesday.
The deceased was identified as Saiful Islam, son of Abul Khayer of Dumuria upazila in Khulna.
Inspector general of police (IGP) A K M Shahidul Hoque said Counter Terrorism and Transnational Crime (CTTC) had secret information that the militants were planning to commit sabotage during August 15 rally at Dhanmondi 32 in the capital.
The police chief briefed media after the operation 'August Bite'.
Police identified militants' spot at Hotel Olio International in Panthapath and fenced off the four-storey building in the early hours of Tuesday, he said.
In the morning, law enforcers asked the extremists to surrender but they did not respond to them.
Around 9:44am, the operation 'August Bite' began after the militant had blasted explosives.
Saiful is a former member of Chhatra Shibir who was a madrasa student, son of a local mosque's imam.
Later, he studied in Political Science at Khulna BL College when he came into connection with New JMB, the police commissioner said.
CTTC chief Monirul Islam said they have known the identification and other details of Saiful from the register book of the hotel located at West Panthapath, he added.