Police say four officers and six civilians have been wounded in another suicide attack in Indonesia's second-largest city of Surabaya.
Footage shows two motorbikes, each with two people on board, coming in to a security post at the entrance to the city's police headquarters before an explosion.
The two motorbikes pull up alongside a car and four officers manning the checkpoint. At the moment of the explosion, two civilians appear to be walking into the checkpoint just metres from the motorbikes.
Three of the officers at the checkpoint are standing right by the motorbikes when the detonation happens.
Police suspect the new attacks are also by extremists linked to the Jemaah Ansurat Daulah group.
"Clearly it's a suicide bombing," East Java police spokesman Frans Barung Mangera told a media briefing.
"We can't be open [about] all details yet because we are still identifying victims at the scene and the crime scene is being handled."
He said the full extent of casualties was unclear.
Indonesian President Joko Widodo said the series of suicide attacks in Surabaya was the "act of cowards" and pledged to push through a new anti-terrorism bill to combat networks of Islamist militants in the country.
"This is the act of cowards, undignified and barbaric," Mr Widodo said on Metro TV.
He said he would issue a regulation in lieu of a law next month to force through a new anti-terrorism bill if Parliament failed to pass it.
Australian Prime Minister Malcolm Turnbull described the attacks as shocking and cowardly, and said he had written to Mr Widodo expressing Australia's heartfelt sympathy.
"The brutality, the barbarity, the inhumanity, the blasphemy of these terrorists strains our ability to believe it but it's there," Mr Turnbull said.
"These people are the worst of the worst."
There was another attack on a different police station in the city last night, about 12 hours after 14 people — including six suicide bombers — were killed in three separate attacks on Surabaya churches.
Members of one family were responsible for the church attacks, including a mother and two young girls wearing suicide belts.
The first attack, at the Santa Maria Roman Catholic Church, killed four people, including one or more bombers, a police spokesman said.
Minutes after the first, there was a second explosion at the Christian Church of Diponegoro that killed two people.
Another two people died in a third attack at the city's Pantekosta Church, the police spokesman said.
