Police in Bangladesh have arrested at least 20 people as part of a campaign to crackdown on bomb attacks blamed on Islamic militants.
Officers made the arrests during a series of overnight raids on Friday in several districts across northern Bangladesh.
In addition to the arrests, officers also confiscated bombs and bomb-making materials.
On Thursday, at least nine people were killed and several others wounded in a bomb blast in the northern town of Netrokona.
The attack occurred despite the nationwide security crackdown since a series of bombings began in August. So far, more than 20 people, including two judges, have been killed.
Police blame the attacks on the outlawed Islamic militant group, Jumatul Mujahedin Bangladesh, which wants to impose strict Islamic law in the Muslim-majority, but secular, country .