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U.S. officials proposed a record $300 million fine Wednesday over an alleged robocall scam they say involved more than five billion unsolicited calls to targeted consumers over three months.

More than 100 people have been arrested in the UK’s biggest ever fraud operation, which brought down a website police describe as a “one-stop spoofing shop” used by scammers to steal tens of millions of pounds from Britons via fake bank phone calls.