Las Vegas: The Worst Mass-shooting in Modern US History

Gunman Stephen Paddock kills at least 58 and wounds over 500 before shooting himself.

Also, Catalan President says he's not seeking a 'traumatic' split with Spain, and three scientists win Nobel Prize for explaining how human body-clocks work.

(US flag flies at half-mast over White House by order of President Trump, after Las Vegas mass-shootings)