More than a month after four US college students were murdered as they slept, no suspects have been named, no arrests made and the murder weapon is yet to be recovered.Madison Mogen, Kaylee Goncalves, Xana Kernodle and Ethan Chapin all studied at the University of Idaho, and the small town of Moscow, Idaho, where they lived is desperate for answers. On the Sky News Daily, Sally Lockwood is joined by Sky's US Correspondent, Martha Kelner, who's spent time in the town, to uncover why more progress hasn't been made, and how the mystery of the students' deaths has gripped America. Editor - Philly Beaumont Producer: Sarah Gough Podcast producer - Rosie Gillott Digital producer - David Chipakupaku