The Sunday Mirror reports that the two GRU military intelligence hitmen named last week were actually part of a crew of six known as The Cleaners.
A source told the paper the others would have arrived at other airports at around the same time as Alexander Petrov and Ruslan Boshirov.
The pair were sensationally named by police over the poisoning of former MI6 mole Sergei Skripal and his daughter Yulia.
Police and MI5 now fear the Novichok was smuggled into Britain's Russian embassy in a diplomatic bag which allows foreign politicians to bring documents into other countries.
Theresa May issued a joint statement with Donald Trump, Angela Merkel, Emmanuel Macron and Justin Trudeau in the wake of new developments in the Novichok scandal.
Putin's diplomats were told to their faces that their boss bears the ultimate responsibility for the attempted hit on ex-spy Sergei Skripal.
Theresa May named the chief suspects as Alexander Petrov and Ruslan Boshirov.
The pair – believed to be officials in the GRU military intelligence agency – are accused of smuggling Novichok into Britain in a perfume bottle and smearing it over Mr Skripal's door handle.
The former double agent, his daughter Yulia and police officer Nick Bailey all fell gravely ill after being exposed to the nerve agent.
And months later, mum Dawn Sturgess, from nearby Amesbury, died when she sprayed liquid from the discarded bottle on herself.
Russia has repeatedly denied any responsibility for the attempted hit and mocked Britain instead of answering the accusations.
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