A spate of deadly, ISIS-inspired bombings that rocked Indonesia's second-largest city in 24 hours were carried out by three families - including their young children - who targeted churches and the police, authorities said.
National Police chief Gen. Tito Karnavian has said the terrorists behind a series of suicide bomb attacks at three churches in Surabaya, East Java, on Sunday, used an explosive type called triacetone triperoxide (TATP). However, the eight year old child amongst them survived.
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.
Police said they arrived after the explosion and shot dead the injured man, Anton Febrianto, as he held a bomb detonator in his hand.
Jakarta police placed the capital and surrounding areas on high alert, while the transportation ministry warned airports to be on guard. The top security minister, Wiranto, who uses one name, said the government will attempt to hasten passage of an updated anti-terrorism law that has languished in parliament.
The organization is known as the main supporter of the Islamic State militant group in Indonesia.
He said 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".
He said the church bombers and the police headquarters attackers were friends, as were another family whose homemade bombs exploded in their apartment Sunday night.
The bombings, the deadliest in Indonesia in more than a decade, also wounded 40 people.
The reflection of a church struck by suicide bombers is seen in Surabaya, Indonesia, May 14.
Formed in 2015, the group linked to the attacks, Jamaah Ansharut Daulah (JAD), is a jihadi group that supports ISIS, according to Jakarta officials. "The United States stands with the people of Indonesia, and we offer our deepest condolences to the families of the victims", the statement read.
Almost 90 percent of Indonesia's 260 million people are Muslim, but there are significant numbers of minority Christians, Hindus and Buddhists. Nearly 10% of the population is Christian.