Police in Bangladesh are questioning 64 people arrested after clashes on Monday between security forces and hundreds of suspected Islamic militants.
Those detained are accused of belonging to a banned Islamic group.
Trouble broke out in western Rajshahi district after three members of the group, the Jagrata Muslim Janata, were lynched by villagers on Saturday.
Supporters of the group took to the streets on Monday. The group is blamed for several vigilante killings.
Its leader, Siddiqul Islam, known also as Bangla Bai, is wanted by the authorities.