During a May 2011 shootout, Indonesia's counterterrorism forces killed the leader of a militant group thought to be behind a series of failed bomb attempts around the city of Solo in Central Java.
The death of Team Hisbah founder Sigit Qurdowi caused the group to splinter. Some formed an anti-vice squad in the city; many others became associated with a former Solo resident called Bahrun Naim, who authorities believe is a leading Indonesian coordinator for the Islamic State group.
Now, five years later, Naim, based in the IS stronghold of Raqqa, Syria, is building an ever-more-sophisticated network of militants from his former hometown, according to police, self-proclaimed radicals and people who work with the militants in Solo.