The parents of a black teenager who was shot dead in Florida are leading demonstrations across America.

Protests are taking place following the acquittal of the man accused of murdering 17 year old Trayvon Martin.

Music stars Jay-Z and Beyoncé are attending one of the marches in New York City (pictured above with Trayvon's mother).

Last weekend, a jury decided neighbourhood watch co-ordinator George Zimmerman acted in self defence when he opened fire in February last year.