A FAMILY of six launched suicide attacks on Christians attending Sunday services at three churches in Indonesia’s second-largest city of Surabaya, killing at least 13 people and wounding 40, officials said yesterday.

Indonesia, the world’s largest Muslim-majority country, has seen a recent resurgence in homegrown militancy and police said the family who carried out yesterday’s attacks were among 500 Islamic State sympathizers who had returned from Syria.

“The husband drove the car, an Avanza, that contained explosives and rammed it into the gate in front of that church,” East Java police spokesman Frans Barung Mangera told reporters at the regional police headquarters in Surabaya.

The wife and two daughters were involved in an attack on a second church and at the third church “two other children rode the motorbike and had the bomb across their laps,” Mangera said.

The two daughters were aged 12 and 9 while the other two, thought to be the man’s sons, were 18 and 16, police said.

They blamed the bombings on the Islamic State-inspired group Jemaah Ansharut Daulah (JAD).

JAD is an umbrella organization on a U.S. State Department “terrorist” list that is estimated to have drawn hundreds of Islamic State sympathizers in Indonesia.

Islamic State claimed responsibility for the attacks, in a message carried on its Amaq news agency.

“This act is barbaric and beyond the limits of humanity, causing victims among members of society, the police and even innocent children,” President Joko Widodo said during a visit to the scene of the attacks.

East Java police spokesman Mangera said the attacks had killed at least 13 people and 40 had been taken to hospital, including two police officers. He called on people to remain calm.

Streets around the bombed churches were blocked by checkpoints and heavily armed police stood guard as forensic and bomb squad officers combed the area for clues.(SD-Agencies)