Just a few incidents.
1987 Ahmebad and Nagpur- outfielders wearing helmets due to being continuously pelted with stones
1989 Karachi- Kapil attacked after a man scaled a wall
97-98- 5 Indains hit by stones in Ind v pak game and Tendulkar taking the Indians from the field
98-99- Crowd disruptions interrupting a test after Tendulkar was runout
1989- Srikkanth attacked by Pakistani fans
1997- Inzi going into the crowd
61-62- 2nd Test Eng vs India. Major crowd troubles
1969- England tour to Pakistan- Massive crowd troubles including the 3rd test abandoned due to riots
77-78- England tour of Pakistan- Marred by continual rioting and attacks on Police and property destruction
04-05- Players walk off the field in Ind-Pak game after massive crowd trouble forcing thousands of paramilitary to attend and Helicopter gunships to patrol the ground
1999- In Calcutta the game was forced to be played (Test vs Ind-Pak) in an empty stadium after disturbances.
Well thats just a few
Ill admit I haven't read it, but here is an article on Indias cricket hooligans. No idea if its from a reputable source or any good.
http://www.hinduonnet.com/fline/fl1924/stories/20021206003810200.htm
Outside the West Indies (a place where there have been many riots) nowhere in the cricketing world has fans that behave in a similar fashion to the exteme Indian and Pakistani fans.