Russian claims of second nerve agent in Salisbury debunked by watchdog

The head of the global chemical weapons watchdog agency has rejected Russian claims that traces of a second nerve agent were discovered in Salisbury where a former Russian spy and his daughter were poisoned.

The UK blames Russia for the attack, which it says was carried out by smearing a Soviet-developed nerve agent known as Novichok on a door handle at Sergei Skripal's house in Salisbury.