The protest and subsequent riot were organized and done mostly by the uighur university student in xinjiang. They got too much time at their hand and lived in the internet 24/7.. spreading rumor and lies and colluding with external separistist folks oversea. That's one big bad side effect of uncontrolled internet which cause this riot.
In the days of internetless, I doubt this riot would occur.
of the 1500 suspects arrested, many of them who got accused of murdering people were done by uighur unverisity students!!
Chinese authority have said doesn't matter if they are students if they found committing murders then they would be executed.