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US civil rights activists are calling on the federal government to investigate the death of a black teenager in southeastern state of Florida.

Trayvon Martin, a 17 year old, was shot in the chest last month by George Zimmerman, 28-year-old volunteer neighbourhood guard who was carrying a 9mm handgun.

Zimmerman admitted to killing Martin but claimed he was acting in self-defence after Martin attacked him. Police, following Florida's unusual interpretation of what it means to act in self-defence, have not arrested Zimmerman.

Rosiland Jordan reports.

Source: Al Jazeera