Files released by prosecution show detectives released Trayvon Martin shooter because his explanation could not be refuted

Detectives were sceptical of George Zimmerman's account of his shooting of the Florida teenager Trayvon Martin when they interviewed him shortly after the fatal encounter, documents released by prosecutors on Tuesday reveal.

But although they found several inconsistencies in Zimmerman's explanations, they felt they could not be "corroborated or refuted by independent witnesses", leading to the release of the neighbourhood watch leader without charge.

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