Indonesian police have identified four out of five of the Jakarta attackers.
Two were previously convicted militants.
Police named one of them as Afif Sunakim. He was seen carrying a gun and rucksack during the attacks. He was given a seven-year jail term for attending a militant camp.
All five died in January 14 attacks, which left two civilians dead and were claimed by ISIS.
Three arrests were made on January 15 but it is unclear if they are connected.
Security forces battled militants for hours in the busy commercial district where the militants struck.
A Canadian and an Indonesian national died, and at least 20 people were injured.
The assault ended when two attackers died in a suicide bombing, police say, with the other three killed in gun battles.
Following recent ISIS threats, Indonesia, which had been attacked by Islamist militants several times in the past, had been on high alert.
Gen. Badrodin Haiti, the national police chief, said Afif Sunakim and one other attacker had both been convicted criminals.
Jakarta’s chief of police, Insp. Gen. Tito Karnavian, said a hunt was under way for terror cells believed to be behind the attack.
Three men were arrested near Jakarta, police told local media.
A police spokesman, Anton Charliyan, confirmed on that those who organized the attacks were associated with ISIS.
Two of the perpetrators, he added, were “known to have committed similar radical activities some time ago”.
Earlier, Bahrum Naim, an Indonesian believed to be fighting with ISIS in Syria, was named as the suspected co-ordinator.
Insp. Gen. Tito Karnavian said Bahrum Naim’s “vision” was to unite various ISIS-supporting groups across South East Asia.
ISIS released a statement saying it had targeted citizens of countries which are part of the international coalition fighting the group, which controls parts of Syria and Iraq.
Insp. Gen. Tito Karnavian said Indonesia had significantly developed its understanding of domestic militant networks since the 2002 bomb attack in Bali, which killed 202 people.
Some 1,000 people linked to radical networks had been brought to justice in Indonesia since 2000, he said, but some had since been released from prison and had “the potential to pose a threat”.
Indonesian President Joko Widodo tweeted on January 15 that there was “no place for terrorism on Earth” and that “every citizen in the world” needed to fight it.
Indonesia has suffered militant attacks in the past, but has been relatively successful in curbing home-grown Islamist extremism after a spate of attacks in the last decade.
At least seven people have been killed after a series of explosions hit the Indonesian capital Jakarta on January 14.
The explosions were centered around Thamrin Street, a major shopping and business district in Jakarta close to foreign embassies and the United Nations offices.
According to police, the situation is now under control, with five suspected attackers among at least seven people killed.
ISIS claimed it carried out the attacks, a news agency linked to the militant group said.
Separately, Indonesian police said they suspected a local group allied to ISIS was to blame.
President Joko Widodo described the attacks as an “act of terror”.
“We all are grieving for the fallen victims of this incident, but we also condemn the act that has disturbed the security and peace and spread terror among our people,” he said.
Images from Jakarta have shown several bodies lying on the road outside a cafe, as well as seriously injured people being carried away.
Details remain unclear, but at least one of the blasts hit a Starbucks cafe and a police security post.
It appears the gunmen then holed up in the Djakarta Theater, part of the complex that houses the Starbucks.
Armed police, snipers and armored vehicles were deployed on the streets of the capital.
Gunfire broke out after police arrived at the cafe – there were several further explosions and reports of police chasing suspects. Sporadic gunfire was reported for several hours afterwards.
A few hours later, police said four attackers had been killed, then shortly after revised the number to five, including a foreigner.
National Police Deputy Chief Commander Gen. Budi Gunawan said two had been killed in a shootout outside a theatre and two others blew themselves up at the police post in front of Starbucks.
Police spokesman Col. Muhammad Iqbal said the situation was “under control”, with no suspects hiding inside the shopping centre.
Police had initially said there could be up to 14 assailants. Three attackers have been arrested, reports say.
Indonesia has been attacked by Islamist militant groups in the past and was on high alert over the New Year period after threats from ISIS.
There has been no confirmation of the group’s claim it carried out the attack, but National police spokesman Anton Charliyan said the group had earlier warned of a “concert in Indonesia” which would be international news.
Anton Charliyan said the attackers had tried to imitate the co-ordinated attacks on Paris and there was a “strong suspicion that this is an ISIS-linked group in Indonesia”.
Up to 200 Indonesians are estimated to have gone to Syria to fight with ISIS.
Indonesia is the world’s most populous Muslim nation but by and large is secular, although in recent years the threat of radicalism has remained high as small networks of militants are still thought to be operating in the country.
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