A dagger entombed alongside the mummy of Egyptian pharaoh Tutankhamun is made with iron that came from a meteorite, researchers say.

Egyptian media says prosecutors refer eight museum employees for trial over the botched reattachment of the beard on the burial mask of the pharaoh, Tutankhamun.

Egyptian officials now say they are "90% sure" that there is a hidden chamber in King Tutankhamun's tomb.