Five suspected Islamic State sympathizers have been arrested in Indonesia, a police spokesman said Tuesday, adding that authorities also confiscated bomb making materials.

The suspects — a married couple and three other men — were detained after a raid by anti-terrorism forces on three locations in the city of Bandung West Java, spokesman Yusri Yunus said.

Police claim the attackers were part of the IS-linked Jamaah Ansharut Daulah (JAD) network that has been blamed for a series of recent attacks in Indonesia including one in Jakarta in January 2016 that left four civilians dead.

“We found evidence in one of the suspects’ houses. The evidence is a bomb made of chemical material,” he told AFP.

Yunus said the group planned to attack the state palace, a local police headquarters as well as officers in the field. Source.