Police in the city of Balikpapan in East Kalimantan province said they had arrested one suspected militant, but it was not clear if he was related to the Jakarta attack, the Antara news agency reported.
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The five militants, who laid siege to a Starbucks cafe and police post at the busy downtown junction of Jalan M.H. Thamrin and Jalan K.H. Wahid Hasyim, were killed during the attacks.
Insp Gen Tito Karnavian told the BBC the actual attacking cell was “tiny” and had been “neutralised”, but was linked to cells in Sulawesi and Java. An estimated 1,000-plus Indonesians are said to sympathize with Islamic State militants and seek opportunities to join the group in the Middle East.
The statement said the attacks targeted a gathering of citizens from the “Crusader coalition”, referring to the US-led alliance of countries combatting IS in Iraq and Syria.
The three arrests were made during raids on homes in Depok on the outskirts of Jakarta, AP reported, citing police.
Naim has formed a Southeast Asian branch of ISIS named Katibah al Nusantara, Indonesia authorities said.
Then two militants outside the coffee shop seized two people – one of them a foreigner – dragged them into a parking lot and shot them, said Charliyan, the Jakarta police spokesman.
Terrorism experts say ISIS supporters in Indonesia are drawn from the remnants of Jemaah Islamiyah.
Indonesia’s national police chief Gen. Badrodin Haiti says all activities of the group responsible for the Thursday attack in Jakarta were funded by the Islamic State movement.
Haiti added that Naim himself was arrested in Indonesia in 2010 for illegal possession of ammunition and received a one-year jail term.
So far, 12 arrests have been made and police have also shut down at least 11 websites and social media accounts. They said the five attackers had been killed either in the initial bombings or later firefight.
A plainclothes police officer aims his gun at attackers during a gun battle following explosions.
Police chiefs across the country were put on high alert, some embassies in Jakarta were closed for the day and security was stepped up on the resort island of Bali, the site of a suicide blast in 2002 which killed 202 people, including Taiwanese Eve Kuo (郭惠敏) and four members of a Taipei-based rugby club.
The press conference was told one of the victims of Thursday’s attack was Canadian Amer Ouali Tahar, who was killed outside Starbucks.
Alarm around the world over the danger stemming from Islamic State rocketed after the Paris attacks in November and the killing of 14 people in California in December. Police said they are still investigating the role of a fifth man known as Sugito.
In Western capitals, Indonesia has always been a kind of poster child for progress: a developing nation with the world’s largest Muslim population that has embraced both democracy and moderate Islam.
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Thousands of people walked, jogged, cycled, roller-bladed and performed music down the city’s main boulevard, with families celebrating the open roads just a few yards away from where the militants carried out their brazen daylight terror attack.
