Third Russian Agent Who Helped Plan Attack On Skripal Identified: Reports

Sergei Skripal and his daughter Yulia were struck down with the poison in March. (AFP)

A third Russian military intelligence officer who carried out a reconnaissance mission before the poisoning of former Russian spy Sergei Skripal has been identified by counter terrorism police and the security services, the Telegraph newspaper reported on Thursday.

The Russian agent is believed to have visited Salisbury to help plan the attack before two of his colleagues brought weapons grade nerve agent into the UK, the newspaper said.

Sergei Skripal and his daughter Yulia were struck down with the poison in March.

They were found unconscious on a public bench in Salisbury on March 4.