Indonesian police have arrested the leader of the Jemaah Islamiyah militant network linked to Al Qaeda, authorities said on Tuesday, on suspicion of recruiting members and sending them to Syria to train with extremist groups.
Counter-terrorism police also arrested at least four other suspects linked to Para Wijayanto, who experts say was a student of Abu Bakar Basyir, accused of being the mastermind of the 2002 Bali bombings that killed more than 200 people.
Mr Wijayanto, who had been on the run since 2003 and had trained with militants in the southern Philippines, was arrested with his wife on Saturday on the outskirts of Jakarta, the capital.
"Jemaah Islamiyah remains a threat because their grand strategy is still to establish a caliphate," national police spokesman Dedi Prasetyo told Reuters.
Indonesia's elite counter-terrorism squad, Densus 88, was created after the 2002 Bali bombings to quash Jemaah Islamiyah and similar groups in the world's largest Muslim-majority country.
Security forces were seen to have broken up militant networks after key figures like Basyir were rounded up and jailed, but many went underground.
"There are still many JI members, and after the fall of Osama bin Laden, they became sleeper cells," said Stanislaus Riyanta, a terrorism analyst based in Jakarta.
"The fall of Islamic State may have left a gap for JI to rise again."
Indonesia scrambled to tighten its antiterrorism laws after a series of suicide bombings killed more than 30 people in the East Java city of Surabaya last year. Hundreds of people have been detained under the new laws since the beginning of 2019.