The suspect alleged to have sent the poisonous substance ricin to U.S. President Donald Trump is also linked to "several" letters sent to different locations in Texas, including the Mission Police Department, CTV News has learned.
The federal police force noted that "our Chemical, Biological, Radiological, Nuclear, Explosives team (CBRNE) is leading the operation".
Flores also said the Mission police had arrested the woman now believed to be held in Buffalo in early 2019, but said he did not have records related to the arrest and referred further inquiries to the Federal Bureau of Investigation. A spokesperson for the Royal Canadian Mounted Police, which confirmed Saturday that it was working with the FBI to investigate the matter, told CNN Sunday that "the RCMP is still not in a position to issue a statement, or to confirm/deny any reports on arrests". However, the woman was taken into custody by Customs and Border Protection officers near Buffalo.
Officials have cordoned a long stretch of Vauquelin Blvd.in Saint-Hubert - a residential street of low-rise condo complexes adjacent to the Montreal Saint-Hubert Longueuil Airport - as part of the investigation. According to the Daily Mail, the woman was arrested trying to enter the USA from Canada at a NY state border crossing.
"We don't know what we're going to find, that's why we've deployed multiple resources, " Poirier said.
Envelopes containing ricin were also mailed to law enforcement agencies in the Rio Grande Valley in South Texas, according to another law enforcement official.
Canadian police investigate poisoned letter sent to President Donald Trump
Reports say she may have had a gun on her at the time of her arrest.
RCMP spokesman Dan Brien said initial information from the investigation suggests the letter originated in Canada. A person familiar with the investigation told CNN's Josh Campbell the letter was mailed from St. Hubert, Quebec, and contained a granular substance with similar physical characteristics to ground castor beans.
The letter was intercepted by officials before it reached President Trump's residence.
-Canada border near Buffalo, New York, on Sunday on suspicion that she sent the deadly poison by mail, addressed to the White House.
USA agencies were investigating whether other ricin letters were sent by the same person to other US addressees, two sources told Reuters.