DHAKA, Bangladesh — A suicide bomber detonated an explosives belt during the Friday Prayer at a mosque in a remote northern village in Bangladesh, witnesses and officials said, wounding three members of the Ahmadiyya Muslim Community, a tiny religious minority.

Saiful Islam, president of the Ahmadiyya community in the village of Mochmoli, said the bomber was the only person killed. The Ahmadiyya, also known as Ahmadis, are members of a Muslim sect considered heretical by many conservative Muslims and are frequent targets of persecution.

Abdullah al-Mahmud, deputy police inspector general for the Rajshahi District, which includes Mochmoli, said the identity and motive of the bomber were unknown. But he said, “This is a rare incident for Bangladesh.”

About 70 people were praying in the mosque at the time, said one worshiper, Mohammad Shaheb Ali Talukder, who was one of the wounded.