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The Special Investigation Unit (SIU), also known as the Crime Investigation Agency (CIA), is a crucial division within the Karachi Police focused on serious crimes. It investigates cases like murder and kidnapping, gathering evidence and building strong cases. The unit also collects intelligence on criminal activities and collaborates with other law enforcement agencies. Additionally, SIU engages with communities to encourage crime reporting and enhance public safety. Overall, it plays a vital role in improving law enforcement and addressing serious crime in Karachi.