Russian agents responsible for the Novichok poisonings in Salisbury, England, sent a coded message to Moscow which included the phrase "The package has been delivered", it was claimed yesterday.
A British intelligence listening station based in Cyprus allegedly picked up the message shortly after former Russian double agent Sergei Skripal and his daughter, Yulia, were attacked in March.
The coded dispatch helped cement suspicions that it was the Russian state behind the attempted assassination, before counterterror police using facial recognition technology and CCTV images were able to identify those responsible.
It is believed the perpetrators flew back to Russia shortly after carrying out the hit, travelling to London from Salisbury by train.
The Daily Telegraph reported in April that key suspects had been identified following the attack.