On Monday, members of another family blew themselves up at a police station in the city, wounding 10. However, the eight year old child amongst them survived. The blast killed the parents and two of their children and wounded six civilians and four policemen.
Police said the father detonated a auto bomb; the two sons, ages 16 and 18, reportedly used motorcycles rigged to explode; and the mother and two daughters, ages 9 and 12, wore explosives on their bodies, the BBC reported. The trio went inside and detonated a bomb.
Karnavian said Futrianto drove a bomb-laden auto into the city's Pentecostal church.
"There were five people on two motorbikes". So, pledges to push through new anti-terrorism laws and condemnation of the attacks from all mainstream Muslim groups in Indonesia while important, are not enough. If a family believed in traditional roles, the father "has the power, so everyone has to obey", Banani said. The family's 12-year-old son reportedly took two younger sisters to the Bhayangkara Police Hospital.
Jemaah Islamiyah, the network responsible for the Bali attacks, was obliterated by a sustained crackdown on militants by Indonesia's counterterrorism police with USA and Australian support.
Jakarta police placed the capital and surrounding areas on high alert, while the transportation ministry warned airports to be on guard.
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"We are going ahead with our preparations", Finance Minister Sri Mulyani said in Jakarta on Monday as reported by Antara. "They have trained in order to attack police", Wasisto said, identifying the militants as members of Jemaah Anshorut Daulah, or JAD.
But the use of children in terrorist plots, analysts say, represents a new and shocking development in Indonesia.
"Then in 2014 there was an uptick in violence as groups linked to ISIS became active, stoked by online propaganda, militants who traveled to the Middle East and fighting in the Philippines". But the fact that children were involved in Sunday's attacks in Surabaya shocked and angered the country.
Security footage shows at least one motorcycle was used in Monday's attack.
Indonesia, which is set to host the Asian Games in just three months, has long struggled with Islamist militancy, including the 2002 Bali bombings that killed more than 200 people - mostly foreign tourists - in the country's worst terror attack. However, hundreds of Indonesians have flocked in recent years to fight alongside IS there.