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.