The personality of a co-pilot suspected of deliberately flying a Germanwings passenger jet into a mountainside in the Alps is a "serious lead" in the inquiry but not the only one, a French investigator said Saturday.
"We have a certain number of elements which allow us to make progress on this lead, which is a serious lead but which can't be the only one," police chief Jean-Pierre Michel told AFP in the western German city of Duesseldorf.