During Sunday morning’s attacks, one suicide bomber appeared to have been disguised as a churchgoer. In another, an attacker drove a Toyota minivan with a bomb the site. Still another attacker was seen in footage speeding on a scooter toward a church before an explosion.
In Sidoarjo, a suburb south of Surabaya, a bomb detonated within a family’s apartment as the police closed in on Sunday night, killing the husband and wife and one of their children, and injuring another three children, said a spokesman for the provincial police, Frans Barung Mangera. He identified the dead suspect as Anton Ferdiantono, 46, who police officials later said was a friend of the man behind the church bombings.
In the final burst of violence, on Monday, four of the five people on the motorcycles were killed, and the fifth, the 8-year-old girl, was taken to the hospital, said Mr. Frans, the police spokesman. Four police officers were reported injured. A video released by an Indonesian news outlet appeared to show the explosion centered on one of the motorcycles, flattening police officers and damaging another car.
The counterterrorism police said they raided another housing complex in Sidoarjo on Monday morning, recovering several completed bombs after having neighboring residents evacuate.