(excerpt)
And in a bombshell move, the Department of Justice has formally told the UK the Duke of York is now caught up in a criminal probe for the first time.
*snip*
But now The Sun can reveal the US Department of Justice has dramatically upped the stakes. It has by-passed Buckingham Palace - instead filing a mutual legal assistance (MLA) request to the Home Office.
MLA requests are only used in criminal cases under a legal treaty with the UK.