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Mohammad Anwar is the senior coordinator for the Muttahida Quami Movement, one of Pakistan's most controversial political parties.

His friend and colleague, Imran Farooq, was murdered at his London home last week, prompting mourning, violence and much speculation in Karachi.

The list of possible suspects is long; the MQM has made many enemies in its career and Farooq is not the first of its members to die a bloody death. What will this powerful party, which controls Pakistan's most important commercial city, do now? With Stephen Sackur.