The Muslim family that carried out suicide attacks on three churches in Indonesia's second-largest city, killing a dozen people as well as its two young daughters, lived comfortably in an upper-middle class suburb and was on friendly terms with a Christian neighbor.
Police say the family that carried out Sunday's suicide bombings had indeed returned to Indonesia from Syria, and IS claimed responsibility for those bombings in a statement carried by its Aamaq news agency.
"Once Islamic State emerged (in 2014) there was anxiety that this would create more movement in jihadi (circles)" and that Indonesians trained in ISIS territory would return home, Barton said.
Video footage of the latest attack on the police headquarters shows two motorbikes approaching a checkpoint just before the blast.
Another family reportedly attacked a police station this morning, wounding 10 people including police officers.
Three children survived and in interviews with police described how they had interacted only with parents and adults of similar ideology.
What preceded the latest attack?
Police also increased security in nearly all major churches in big cities such as Jakarta, Surabaya, and Medan.
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Church bomber Oepriarto's "family is linked to another family", said Karnavian on Monday night, declining to name them as authorities were trying to track them down. A 28-year-old woman had planned to bomb the Presidential Palace last year but was caught and jailed, he added.
Police have complained that laws do not give them enough powers to detain suspects to prevent attacks.
Another suicide bombing took place at a low-priced apartment in Sidoarjo on Sunday, while a suicide attack at the Surabaya Police headquarters occurred on Monday.
The East Java Police have found a connection between the church bombings and Sidoarjo bombing.
Police said they also shot dead four suspects, including the second-ranking member of the JAD cell in Surabaya, in raids on houses and offices Monday while nine others were arrested.
What has the reaction been?
"This is a cowardly act, undignified and inhumane", Indonesian President Joko Widodo told reporters in Jakarta. Abuza questioned the police suggestion that the attacks were ordered by the IS leadership overseas but said it would likely boost its presence in Southeast Asia as it fades elsewhere. Three children from the family, who had also been put to terror work, survived and have been hospitalised.
"These people are the worst of the worst". They're threatening people's harmony and religion.
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The South East Asian country has long struggled with Islamist militancy.
Aman Abdurrahman is now on trial for several bombings in the country in recent years, including the deadly January 2016 attack in Jalan M.H. Thamrin, Central Jakarta.
Security forces have arrested hundreds of militants during a sustained crackdown that smashed some networks.
Abdurrahman has been connected to several deadly incidents, including a 2016 gun and suicide attack in the capital Jakarta that left four attackers and four civilians dead.
Oepriarto was the head of the Surabaya extremist group.
The use of children in the attacks has been particularly horrifying to people.
Who are the IS-inspired group?
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