Boris Johnson accused of misleading public over evidence on Salisbury attack

Labour leader Jeremy Corbyn has accused Boris Johnson of "exaggeration" over the evidence that Russia was to blame for the Salisbury poisoning.

Mr Johnson has come under fire after an announcement on Tuesday that Porton Down scientists had not verified the source of the Novichok nerve agent believed to have been used in the March 4 attack on Sergei and Yulia Skripal.