Two Russian nationals have been identified as suspects over the Salisbury nerve agent attack.
Police and prosecutors said there is sufficient evidence to charge Alexander Petrov and Ruslan Boshirov with conspiring to murder Sergei Skripal and attempting to murder the ex-Russian spy, his daughter Yulia and Wiltshire Police detective sergeant Nick Bailey.
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Matropolitan Assistant Commissioner Neil Basu said the two suspects are aged around 40 and it is likely they were travelling under aliases and Petrov and Boshirov are not their real names.
Prosecutors will not be applying to Russia for the extradition of the two men, but a European Arrest Warrant has been obtained.
Mr Skripal and his daughter Yulia were poisoned in March by the nerve agent Novichok.