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OTTAWA — Police warned MPs and senators to be “viligent” after a handful of senators’ offices on Monday received envelopes scrawled with threatening messages and containing white powder.

The RCMP declared the substance harmless and no one who came in contact with the mail showed signs of illness.

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One envelope was marked “Ottawa shooting,” according to a security notice sent to senators, while another had “Shooting in Parliament” written in blue ink in the return address area.

The mystery envelopes were sent to the offices of several senators, including at least two in the East Block of Parliament Hill, at least one in the nearby Victoria Building on Wellington Street, and one in the Centre Block office of government Senate leader Claude Carignan.

On a day when the majority of senators were travelling back to Ottawa after a one-week break, an unknown number of such envelopes were also found, not yet delivered, in the Senate’s mail room.