Search warrants have been issued as part of the RCMP's criminal investigation of Sen. Mike Duffy, Â鶹´«Ã½ has learned.

Sources say the search warrants were recently filed in the Ottawa courthouse.

But the judge who granted the warrants also issued a sealing order. That means details of what the RCMP are looking for will be kept under wraps.

Sources say the search warrants would allow the Mounties to search Duffy's Ottawa-area home and his cottage in P.E.I.

The RCMP is also expected to get a production order to search Duffy's Senate office.

When asked if the RCMP had met with him Thursday, Duffy said: "It would be inappropriate for me to offer any comment."