Bangladeshi police say they have seized a large store of bomb-making equipment and arrested four suspected Islamic militants in the city of Rajshahi.
The explosives and detonators were discovered in raids on two houses by the elite Rapid Action Battalion, hours after the suspects were detained.
It is the second police operation this week aimed at members of the radical Islamic group, Jamaat-ul-Mujahideen.
The group has been blamed for a series of bomb attacks.
On Wednesday, officers detained three suspected senior members of the group and captured arms and explosives in a raid in the capital, Dhaka.