Indonesian President Joko Widodo has called for calm and unity hours after the twin blasts at the busy Kampung Melayu bus terminal in Jakarta's east on Wednesday night.
The bombs went off minutes apart, killing three police officers and leaving at least 11 people injured.
Authorities continued to collect evidence on Thursday, with National Police Spokesman Inspector General Setyo Wasisto saying they believe the perpetrators were "related" to Islamic State.
They are trying to identify them through forensic testing and with the help of Indonesian anti-terrorism agency Detachment 88.
Police give information on the attack
The attack comes just days after the suicide bomb attack at Manchester Arena in the UK that killed 22 people.
"Incidents in other parts of this world could be the trigger or inspiring cells which were hiding on the ground," Inspector Gen Wasisto told reporters in Jakarta.
"After those attacks, they're inspired to do the attack.
Body bags are lined up as police officers conduct their investigation near the site in Jakarta (AAP) Source: AAP
"I ask the people, let's come together to fight terrorism. Secondly, don't be afraid."
Mr Widodo called for everyone to "keep calm and maintain unity".
"I convey my deepest condolences to the victims' families ... especially to the policemen," he said in a statement.
The blasts are the latest in a string of attacks since 2010 that have targeted police, who are seen as the enemy due to Detachment 88, which has been the major agency arresting and in some cases killing people involved in pro-Islamic State cells.
The attack comes just before Indonesia the holy month of Ramadan, which shows a push to "step up activities" before and during this time on the Islamic calendar, said Dr Sidney Jones, the director of Institute for Policy Analysis of Conflict.
The blasts went off five minutes apart at Jakarta's Kampung Melayu terminal (Google Earth/SBS) Source: Google Earth SBS
Australian authorities have reminded travellers of the "ongoing high threat of a terrorist attack in Indonesia", telling people to be vigilant and exercise caution when visiting the archipelago.
Turnbull condemns Jakarta suicide blasts
Australian Prime Minister Malcolm Turnbull told parliament he had offered his condolences and support to Mr Widodo.
"While we mourn we must learn from these events as we do and sharpen our resolve to defeat the terrorists abroad and at home," Mr Turnbull said.
