Bangladeshi security forces have detained nearly 100 people during an intense search for those behind Wednesday's bomb blasts that killed two people and wounded more than 100 others.
Officials say at least one suspect captured in Satkhira confessed to belonging to the outlawed Islamic group Jamatul Mujahedin Bangladesh. Leaflets from the group calling for Islamic rule in Bangladesh were found at several blast sites.
But no one has yet claimed responsibility for Wednesday's attack, which involved 400 homemade bombs going off almost simultaneously in Dhaka and other cities.
Meanwhile, a Bangladeshi official said Prime Minister Khaleda Zia has decided to cut short her visit to China in the wake of the bombings and plans to return home on Friday.