Minst 21 mennesker ble drept da to selvmordsbombere detonerte seg selv i den største moskeen i byen Zahedan i den iranske delen av Baluchistan. Den militante sunni-gruppen Jundallah har påtatt seg ansvaret.

Twin suicide bombings outside a prominent Shi’ite mosque in southeastern Iran have killed at least 21 people, including worshippers and members of the country’s powerful Revolutionary Guard.

The attacks late Thursday wounded more than 100 others at the main mosque in Zahedan, the capital of Sistan-Baluchistan province, and came as Shi’ites celebrated the birthday of the Prophet Muhammad’s grandson, Imam Hussein. The day is also set aside each year to honor the Revolutionary Guards.

The Sunni Muslim militant group Jundallah claimed responsibility for the bombings on its website, saying it had carried them out in retaliation for Iran’s execution in June of the group’s leader, Abdolmalek Rigi. Iran had convicted the militant leader of terrorism.

Jundallah said the bombings were carried out by relatives of Rigi, Mohammad Rigi and Abdulbaset Rigi, and warned of more explosions to come.

Jundllah, or Soldiers of God, said it carried out a similar mosque attack two months ago that killed 25 people in Zahedan. The group also claimed responsibility for a bomb attack last October that killed 57 people, including several top Revolutionary Guard commanders.