My temporary conclusion, Riau are terrorist home-base and Surabaya are potential terrorist targets. If you receive a security warning about potential terrorist attack, so you should put your eyes on Riau and Surabaya.
So now we found this 4 connectivities :
Relationships between Arief Sulistyanto and Australian govt when Indonesian police dept receive grant (cyber-crime tools)
Terrorism, Surabaya attacks (May 13, 2018) and Riau University raids (June 3, 2018).
Arief Sulistyanto promotions as Kabareskrim (August 17, 2018)
Australian warning for potential Surabaya attacks (August 23, 2018).
Suddenly, we were surprised by #2019GantiPresiden Declarations in Riau and Surabaya on Sunday, August 26, 2018.
Interesting, right?
This #2019GantiPresiden hashtag movement, now become most popular talk in Indonesian political segment.
Arief Sulistyanto 'the police' told the media to ask the KPU and Bawaslu. He avoids giving a clear answer. August 28, 2018, Kabareskrim : Kasus Tagar 2019 Ganti Presiden Ranah Bawaslu.
The electoral authority said, the #2019GantiPresiden Declarations did not violate campaign rules. August 29, 2018, KPU - Bawaslu Izinkan #2019GantiPresiden.