Last updated 20:40, May 14 2018
A suicide bomber on a motorbike wounds several Indonesian police outside a police building in Surabaya.
An Indonesian family detonated explosives outside police headquarters in the country's second largest city on Monday, a day after members of another family launched coordinated suicide bombings on three city churches that killed at least eight people.
National police chief Tito Karnavian said a girl aged about eight who was with two of the attackers on a motorcycle survived being thrown by the blast at Surabaya's police headquarters. The attack killed the four perpetrators. Six civilians and four officers were wounded.
The attack came just hours after police said the family that carried out the church bombings included girls aged nine and 12.
The flurry of attacks have raised concerns that previously beaten down militant networks in the world's most populous Muslim-majority nation have been reinvigorated by the return of some of the estimated 1100 Indonesians who went to fight with Isis in Syria. Experts have warned for several years that when those fighter return, they could pose a significant threat.
Indonesian police stand guard outside the Surabaya police headquarters following another terrorist attack.
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Isis claimed responsibility for the church bombings in a statement carried by its Aamaq news agency. Karnavian, however, said earlier police comments that the family had spent time in Syria were incorrect.
He said the church bombers and the police headquarters attackers were friends, as were another family whose homemade bombs exploded in their apartment on Sunday night.
The use of children in the attacks has been particularly horrifying to people. Indonesia's president Joko "Jokowi" Widodo condemned them as "barbaric" and vowed that authorities would root out and "destroy" Islamic militant networks.
Security camera footage of the attack on Surabaya's police headquarters showed at least one explosion after the four attackers rode two motorcycles up to a security checkpoint. The motorcycles, which moved closely together, pulled up alongside a car and four officers manning opposite sides of the checkpoint.
Two men, apparently civilians, were walking into the area just metres from the motorcycles at the moment of the explosion, which a split second later was followed by a second possible blast.
Family of six were behind the wave of blasts targeting three churches in Indonesian city of Surabaya.
Indonesia's deadliest terrorist attack occurred in 2002, when bombs exploded on the tourist island of Bali, killing 202 people in one night, mostly foreigners. Jemaah Islamiyah, the Al-Qaeda affiliated network responsible for the Bali attacks, was obliterated by a sustained crackdown on militants by Indonesia's counterterrorism police with U.S. and Australian support.
Karnavian has said the father of the family that carried out the church bombings was head of the Surabaya cell of Jemaah Anshorut Daulah, an Indonesian militant network affiliated with Isis that has been implicated in attacks in Indonesia in the past year. All six members of the family were killed.
The Isis statement claiming the attacks didn't mention anything about families or children taking part and said there were only three attackers. The group also claimed responsibility for a hostage-taking ordeal last week by imprisoned Islamic militants at a detention centre near Jakarta in which six officers were killed.
Separately on Sunday, three members of another family were killed when homemade bombs exploded at an apartment in Sidoarjo, a town bordering Surabaya, police said.
The church attacks occurred within minutes of each other, according to Surabaya police spokesman Frans Barung Mangera.
Karnavian said the father drove a bomb-laden car into the city's Pentecostal church. The mother, with her two daughters, attacked the Christian Church of Diponegoro, he said. Based on their remains, Karnavian said the mother and daughters were all wearing explosives around their waists.
Armed Indonesian officers set up a police line outside the Surabaya police headquarters after the deadly blast.
The sons aged 16 and 18 rode a motorcycle onto the grounds of the Santa Maria Church and detonated their explosives there.
The church attacks occurred within minutes of each other, according Mangera.
Karnavian said the father drove a bomb-laden car into the city's Pentecostal church. The mother, with her two daughters, attacked the Christian Church of Diponegoro, he said. Based on their remains, Karnavian said the mother and daughters were all wearing explosives around their waists.
The sons aged 16 and 18 rode a motorcycle onto the grounds of the Santa Maria Church and detonated their explosives there.
The fact that children were involved in Sunday's attacks has shocked and angered the country of more than 260 million people.