The FBI is investigating reports that Rupert Murdoch's News Corporation sought to hack the phones of victims of the 9/11 terror attacks, reports say.
Reports of a criminal probe come as a growing group of senators and a senior Republican congressman have called for an investigation.
An FBI official told the BBC that reports of probe were "credible".
An FBI inquiry would be the first sign the phone hacking scandal has crossed the Atlantic, analysts say.
News Corporation is the parent company of News International, the UK firm at the centre of a growing scandal.
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