As part of their investigation into the criminal activities of Philip Baron, and his associates, dubbed Operation Beath by the Serious Organised Crime Agency (SOCA), police seized £800,000 in cash.
In one operation SOCA, working with West Yorkshire Police, seized £380,000 from a courier off the M62 near Leeds.
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The prime minister was shouted at as she left the scene of the tragedy in which at least 79 people died.
Father-of-six Makram Ali, 51, was already receiving medical treatment as the attack unfolded. He died from multiple injuries, police say.
A review of how police and security services dealt with the latest terror attacks in the UK is to be launched, Amber Rudd has announced.