Suicide bombing at a police headquarters in the Indonesian city of Surabaya on Monday was carried out by a family of five riding on two motorbikes, police say.
It came after another family carried out bomb attacks on three churches on Sunday. Police blamed an Islamic State-inspired network.
An eight-year-old daughter survived the latest attack, police say.
Indonesia is the world’s most populous Muslim-majority country.
The archipelago, home to 260 million people, has seen a resurgence of Islamist militancy in recent years but the scale of the attacks in Surabaya has raised fresh concerns about the potency of jihadist networks.
Video footage of the latest attack on the police headquarters shows two motorbikes approaching a checkpoint just before the blast. Six civilians and four police officers were injured, the authorities say.
The young girl who survived had been wedged between her mother and father on the motorbike as they carried out the attack. CCTV footage shows her stumbling around after the blast.
he bomb that exploded on Sunday night in an apartment killed three members of a family who police said may have been planning an attack and had connections with Oepriarto. Pipe bombs were found.
Separately, police said on Monday that they had arrested six people plotting attacks in Surabaya, the Jakarta Post reported.
What has the reaction been?
President Joko Widodo has described the attacks as “cowardly, undignified and inhumane” and said he will push through a long-awaited anti-terrorism bill if parliament does not pass it.
The bill has faced criticism from human rights groups, but defenders say it is needed to prosecute militants returning from the Middle East.
“There will be no compromise in taking action on the ground to stop terrorism,” he said.
Officials said police, backed by military forces, would increase security across the country.
In Australia, Prime Minister Malcolm Turnbull said the nature of Sunday’s attack – involving an entire family – “almost beggars belief”.
“These people are the worst of the worst. They are threatening civilised nations, they’re threatening civilised way of life. They’re threatening people’s harmony and religion. They are debasing and defaming Islam, as President Widodo has often said.”
(c) Reuters 2018