The Muslims were agitated because they were angered over the Bodos (tribal, who are Christians and animists) causing 'trouble' for the Muslims.

They were also enraged over SMSes and MMSes circulated to them on the riots as also of the riots in Burma where the Burmese pushed out the Rohigyas (Muslims of the Arakan). Bangladesh pushed these Muslim Rohingyas back!

They were angered that India had not done anything to Burma for what they had done to the Rohingya Muslims and they wanted action against the Bodos also.

It will be interesting to note that these MMSes were doctored.

Videos doctored in Pakistan sparked NE exodus: Government

In one instance, images of death and destruction caused by a cyclone have been morphed to be passed off as a case of atrocity on Muslims in Assam. In others, bodies of victims of an earthquake which occurred months ago was juxtaposed with photographs of Buddhist monks to project violence on Muslims in Myanmar by Buddhists.

http://m.timesofindia.com/india/Vide...w/15550503.cms