Russia calls British 'liars' over nerve gas claims

Russia rejects British Prime Minister's claim that the Kremlin was behind 'attempted murder' of former spy and his daughter on British soil.

Also in the programme: US students walk out to demand gun law reform; and the death, at 76, of brilliant physicist Stephen Hawking.

Picture: British Prime Minister Theresa May addresses Parliament on her government's reaction to the poisoning of former Russian spy Sergei Skripal and his daughter. Credit: Parliament TV