New video of the man who killed an African-American teenager in the US state of Florida has raised new questions about what really happened the night that Trayvon Martin lost his life.<br /><br />George Zimmerman, who appointed himself as an armed neighbourhood watchman, says he shot the 17-year-old Martin in self-defense after the young man attacked him on the street, leaving his face bloodied. <br /><br />But the release of a new video shows Zimmerman arriving at the local police station without signs of blood on his face or clothes, as he had claimed.<br /><br />Al Jazeera's Andy Gallacher reports from Miami.
