Unreported World: Pakistan - Defenders of Karachi - 2011 04 15 (Channel 4)

Reporter Peter Oborne and director Edward Watts travel to Karachi in Pakistan,
where they investigate claims that the number of civilians dying in political,
ethnic and criminal violence is on the rise. They uncover how a growing      
population has put pressure on homes, water, food and jobs, leading to clashes
between rival ethnic groups, including Pashtuns, Mohajirs, Sindhis and Baluch,
who live in segregated areas within the city