The explosives found in the Narayanganj militant den were similar to the ones used in the recent attacks on police, said Monirul Islam, chief of Counter-Terrorism and Transnational Crime (CTTC) Unit.
A large number of bombs, improvised explosive device (IED), detonators and explosive-making equipment were recovered from the house in Takkarmath area of Fatullah.
The law enforcers blasted four bombs found at the den.
Members of the CTTC and other law enforcement agencies raided the house based on information gleaned from Farid Uddin Rumi, who had been held in another drive in the same area earlier this morning.
The law enforcers conducted the first drive at the house of Joynal Abedin, a retired deputy general manager of Bangladesh Bank, based on information provided by Mizanur Rahman alias Rafiq, 25, arrested on Sunday night from Dhaka.
Joynal's son Rumi, 27, a teacher of Ahsanullah University of Science and Technology, and his wife Jannatul Foara Onu, 23, a former student of Government Tolaram College, Narayanganj, were detained from the house.
All of them were active members of the Neo JMB, claimed the crime unit chief.
The CTTC came to know about several other people connected with the outfit, said Monirul.
They were trying to arrest them, he added.
Joynal Abedin has been absconding since morning.