The RCMP say they’re conducting an operation south of Montreal in connection with an envelope containing the poison ricin that was sent to the White House.
The police force said Monday on Twitter the operation is occurring on Vauquelin Blvd. in St-Hubert, on Montreal’s south shore.
The RCMP’s Chemical, Biological, Radiological, Nuclear, Explosives team is leading the operation with support from local police and firefighters.
Police says all necessary measures have been taken to ensure public safety.
Canadian law enforcement was called in to help the FBI investigate after American authorities found evidence the suspicious letter had originated in Canada.
Three U.S. law enforcement officials said a woman suspected of sending the envelope was arrested at the New York-Canada border.
They said the letter had been intercepted last week before it reached the White House.
The woman was arrested by U.S. Customs and Border Protection officers at the Peace Bridge border crossing in Fort Erie, Ont., and she is expected to face federal charges. Her name was not immediately released.