Amelia Earhart researchers leave remote atoll empty-handed after ‘plane debris’ found to be a clump of trees

<p>Expedition was drawn to Nikumaroro after spotting what was described as a metallic glint in waters off uninhabited island</p><p>A US expedition that voyaged to a remote Pacific island in the hope of solving the mystery of what happened to pioneering pilot Amelia Earhart has said