WASHINGTON (CBSDFW.COM/AP) — The woman suspected of trying to send an envelope containing the poison ricin to the White House is also suspected of sending similar letters with poison inside to several Texas law enforcement agencies.

The woman, whose name has not been released, was arrested at the New York-Canada border and is expected to appear in federal court on Monday. The woman was taken into custody by U.S. Customs and Border Protection officers at the Peace Bridge border crossing near Buffalo and is expected to face federal charges, three law enforcement officials told The Associated Press.

The letter addressed to the White House was intercepted earlier this week before it reached its destination. The letter appeared to have originated in Canada, the Royal Canadian Mounted Police have said. It was intercepted at a government facility that screens mail addressed to the White House and President Donald Trump and a preliminary investigation indicated it tested positive for ricin, according to the officials.

Envelopes containing ricin were also mailed to law enforcement agencies in the Rio Grande Valley in South Texas, according to another law enforcement official. The official did not say which agencies were sent the envelopes but said they are believed to have been mailed by the same person who sent one to the White House.

The officials were not authorized to discuss the ongoing investigation publicly and spoke on condition of anonymity.

The Royal Canadian Mounted Police in Quebec confirmed Monday there is a police investigation taking place on a street in St-Hubert, Quebec, related to the contaminated letter sent to the White House.

“Our Chemical, Biological, Radiological, Nuclear, Explosives team (CBRNE) is leading the operation. Police and Fire teams from Longueuil are also on site. All necessary measures have been taken to ensure public safety,” Quebec RCMP said in a tweet.

There have been several prior instances in which U.S. officials have been targeted with ricin sent through the mail.

A Navy veteran was arrested in 2018 and confessed to sending envelopes to Trump and members of his administration that contained the substance from which ricin is derived. The letters were intercepted, and no one was hurt.

In 2014, a Mississippi man was sentenced to 25 years in prison after sending letters dusted with ricin to President Barack Obama and other officials.

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