Suicide bombers have killed at least 11 people and wounded 40 in attacks on Christians attending Sunday morning services at three churches in Indonesia's second-largest city of Surabaya, officials have said.
Indonesia, the world's largest Muslim-majority country, has seen a recent resurgence in homegrown militancy inspired in part by so-called Islamic State.
East Java police said explosions took place in three churches and at least 11 had died and 40 had been taken to hospital.
Officials said a family of six was behind the attacks.
"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.
The wife and two daughters were involved in the attack on a second church and at the third church "two other children rode the motorbike and had the bomb across their laps", Mr 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.
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Police blamed the bombings on the Islamic State-inspired group Jemaah Ansharut Daulah (JAD).
JAD is an umbrella organisation on a US State Department terrorist list that is estimated to have drawn hundreds of Islamic State sympathisers 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.
Indonesian terrorism analyst Rakyan Adibrata said it was the first time children had been involved in attacks in the country.
