The three families that carried out bombings this week in the Indonesian city of Surabaya knew each other and had all studied together in a Quran study group, according to authorities.
A husband and wife used their four children in a string of deadly suicide attacks on three churches in the Indonesian city of Surabaya that left 12 people dead, according to the country's ranking police official.
Coordinated suicide bombings carried out by members of the same family struck three churches in Indonesia's second-largest city Sunday, police said, as the world's most populous Muslim nation recoiled in horror at one of its worst attacks since the 2002 Bali bombings.
The family that carried out suicide attacks against three churches in Surabaya, Indonesia, Sunday was linked to Jamaah Ansharut Daulah (JAD), a jihadi group that supports ISIS, according to Jakarta officials.