A family of six suspected to be inspired by  ISIS attacked Christians attending service at three churches in Indonesia's second largest city of Surabaya, killing 13 and injuring 40.

Indonesia, the world’s largest Muslim majority country is seeing the increase in homegrown terrorism and police said the family who did this is among 500 ISIS influenced people 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.

ISIS-inspired group Jemaah Ansharut Daulah (JAD) is accused of bombing. JAD is on US State Department “terrorist” list that is estimated to have drawn hundreds of ISIS believers in Indonesia.

ISIS 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.

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