Indonesians on Thursday took to social media to declare “We are not afraid” after a double suicide attack killed three policemen and wounded 10 other people.
Two suicide attackers also died when they detonated bombs at the busy Kampung Melayu bus terminal in eastern Jakarta late Wednesday, police said.
At least 10 people were injured, including five police officers.
“#wearenotafraid Let’s fight ISIS and other radical groups in Indonesia. Don’t give them space!” Yusuf Muhammad wrote on Twitter, referring to the Islamic State group.
No group has claimed responsibility for the attack, but police spokesman Martinus Sitompul said investigators were focusing on a network linked to Islamic State.
“We suspect that the perpetrators were part of the ISIS network,” he told CNN Indonesia, adding that it bore the hallmarks of previous attacks by local Islamic State-linked militants, including the use of pressure cooker bombs.
Police said investigators had recovered a receipt for the cooker purchase from the body of one of the attackers.
Indonesian President Joko Widodo condemned the attack and offered condolences to the victims.
“I have ordered the police chief to root out the networks of the perpetrators,” Joko said. “This is outrageous.”
Officers were guarding a parade to mark the Muslim fasting month of Ramadan, which starts on Saturday, when the attack occurred near a bus shelter.
Police have frequently been targeted by attackers in Indonesia following a crackdown on Islamic militants in the wake of the 2002 Bali bombings, which killed 202 people.
Wednesday’s attack was the second to hit the Indonesian capital in less than two years.
In January 2016, a gun and bomb attack in Jakarta’s business district killed eight people, including four attackers.
Indonesia, the world’s most populous Muslim-majority country, has been hit by a spate of terrorist attacks that have killed hundreds of people since 2000.