Skripal Novichok poisoning: Russian suspects pictured

Two Russians have been named as suspects in the attempted murder of former Russian spy Sergei Skripal and his daughter Yulia. The men using the names Alexander Petrov and Ruslan Boshirov, are thought to be officers from Russia's military intelligence service. UK Prime Minister Theresa May says they have obtained a European arrest warrant for both men. The BBC's security correspondent Frank Gardner talks to Susie Ferguson.