(Recasts, adds details from police chief)
By Agustinus Beo Da Costa and Stanley Widianto
JAKARTA, March 29 (Reuters) - Indonesian police discovered
powerful explosives and arrested more suspected Islamist
militants on Monday, after a series of raids following a suicide
attack a day earlier outside a cathedral on the first day of the
Easter Holy Week.
The two bombers were the only fatalities in Sunday's attack
in the city of Makassar on Sulawesi island, which wounded 19
people and took place as mass was finishing. Police said the bombers were a married couple who belonged
to Jamaah Ansharut Daulah (JAD), an Islamic State-inspired group
suspected of suicide attacks on churches and a police post that
killed at least 30 people in the city of Surabaya in 2018.
National police chief Listyo Sigit Prabowo said 13 people in
Greater Jakarta, West Nusa Tenggara and Makassar had been
arrested since the attack and had different roles in its
execution, from making the explosives to detonating them.
Listyo said 5.5 kg (12.13 lb) of explosives and several
ingredients from the raids, including triacetone triperoxide
(TATP), a powerful but unstable mixture often used by Islamist
militant groups.
Listyo told a news conference the male bomber wrote a letter
to family expressing his intentions to die for his beliefs.
About 20 suspected JAD members were arrested in January, and
authorities believe JAD was involved in the twin suicide attack
on a Philippine church in 2019 that killed more than 20 people
and wounded more than 100.
Makassar, the biggest city on Sulawesi island, reflects the
religious makeup of Indonesia, which is the world's largest
Muslim-majority country and has a substantial Christian
minority, among other faiths.
(Editing by Martin Petty)