A family of five, including a child, carried out the suicide bombing of a police headquarters in Indonesia's second city Surabaya today, police said, a day after a deadly wave of attacks on churches staged by another family.
The spate of bombings has rocked Indonesia, with the Islamic State group claiming the church attacks and raising fears about its influence in Southeast Asia as its dreams of a Middle Eastern caliphate fizzle.
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 over 200 people -- mostly foreign tourists -- in the country's worst-ever terror attack.
Security forces have arrested hundreds of militants during a sustained crackdown that smashed some networks, and most recent attacks have been low-level and targeted domestic security forces.
But that changed yesterday as a family of six -- including two young girls -- staged suicide bombings of churches during morning services in Surabaya, killing 18 including the bombers.
Today, members of another family blew themselves up at a police station in the city, wounding 10.
"There were five people on two motorbikes. One of them was a little kid," national police chief Tito Karnavian said. "This is one family." An eight-year-old girl from the family survived the attack and was taken to hospital, while her mother, father and two brothers died in the blast, he said.
The church attacks were claimed by the Islamic State group.
"It ordered and gave instructions for its cells to make a move," Karnavian said of the Islamic State's role in the church attacks.
He added that the bombings may have also been motivated by the arrest of JAD leadership, including jailed radical Aman Abdurrahman, and were linked to a deadly prison riot staged by Islamist prisoners at a high-security jail near Jakarta last week.
Despite their apparent allegiance to IS, the church-bombing family were not returnees from Syria, police said Monday, correcting their earlier statements.
However, hundreds of Indonesians have flocked in recent years to fight alongside IS in its bid to carve out a caliphate ruled by strict Islamic law.
Its ambitions have been reined in after losing most of the land it once occupied in Iraq and Syria, and there are concerns that jihadists will now turn their focus on establishing a base in Southeast Asia.
On Sunday evening, just hours after the church bombings, a further three people in another family were killed and two wounded when another bomb exploded at an apartment complex about 30 kilometres from Surabaya.
That explosion appeared to have been an accidental detonation that killed a mother and her 17-year-old child who was not identified.
The woman's husband -- a confidante of the husband behind the church bombings Dita Oepriyanto -- was badly injured in the explosion.
Police said they arrived after the explosion and shot the injured man, Anton Febrianto, as he held a bomb detonator in his hand.
"When we searched the flat we found pipe bombs, similar to pipe bombs we found near the churches," said Karnavian.
Authorities said Monday they shot a suspect described as the second-ranking member of the JAD cell in Surabaya, while four others were arrested.
Indonesian police have foiled numerous terror plots, but the coordinated nature of Sunday's church bombings and the subsequent blasts point to more sophisticated planning than in the past, analysts said.
"There is definitely a growing technical proficiency," said Zachary Abuza, Southeast Asian security expert at the National War College in Washington.
"To pull off three near simultaneous bombings is hallmark of a group that is thinking." Abuza questioned the police suggestion that the attacks were ordered by the IS leadership abroad, but said it will likely boost its presence in Southeast Asia as it fades elsewhere.
"(They're) going to continue to benefit from operating transnationally in Southeast Asia," he said.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)