Jeremy Corbyn's spokesman has said there is not yet definitive proof the Russian state was behind the attempted murder of a former spy in Salisbury.
He said the most likely explanation was Russia that was "directly or indirectly responsible" for the attack but "culpability takes many forms".
He pointed to the "problematic history" of UK intelligence on chemical weapons.
It came as several Labour MPs called for their leader to be firmer in his condemnation of Russia.
http://www.bbc.co.uk/news/uk-politics-43405680