In response to his imprisonment , the leadership in JAD was handed to Zainal Anshori . However , Anshori was immediately arrested after authorities stated that he was involved in weapon smuggling in Southern Philippines . This reportedly infuriated the members of the JAD and JAT . In response , the members of the JAD and the JAT started to attack civilians and police officers . The first major attack was the 2018 Mako Brimob standoff , days before the Surabaya bombings
2018 Mako Brimob standoff
2018 Mako Brimob standoff
Surabaya bombings