Scientists at a U.K. government laboratory have not verified the source of the substance used to poison Russian ex-spy Sergei Skripal and his daughter, Yulia, according to the lab's chief executive.

When I first arrived at the top secret Porton Down laboratory, I was aware of very little about its activities. I knew it was the UK's chemical defense research center and that over the years it had ...

(MENAFN- The Conversation) When the UK's offensive chemical and biological weapons programmes were terminated in the 1950s, work at the high-security military research centre in Porton Down, Wiltshire ...