US-North Korea War of Words Intensifies

The war of words intensifies as the US tightens sanctions on Pyongyang and thanks China for its help. Kim Jong-un describes Donald Trump as 'mentally deranged' -- and warns he'll pay dearly for the speech he made earlier this week at the UN General Assembly. Also: Facebook promises to tackle online political meddling; and David Attenborough reflects on his travels to collect animals from the four corners of planet earth.
(Photo: Kim Jong-Un delivers statement in Pyongyang. Credit: AFP)