Trayvon Martin
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Trayvon Martin's family speak out over murdered son

Tens of thousands of people are expected in Washington DC later, to commemorate the 50th anniversary of Martin Luther King's March on Washington, a key milestone in the civil rights movement.

Among the speakers at the rally are the parents of the black teenager Trayvon Martin, who was killed last year.

In their first UK interview since George Zimmerman was found not guilty of their son's murder, they told the BBC they want to change laws regarding self-defence.

Speaking to Rajini Vaidyanathan they say they are in the process of forgiving their son's killer.