Police in Canada have been searching an apartment in a Montreal suburb that's linked to a woman arrested on suspicion of sending an envelope filled with ricin to the White House.
The woman was arrested at the U.S.-Canada border near Buffalo, New York on Sunday (September 20).
She will appear before a federal court in Buffalo.
Two sources said the woman has joint Canadian and French citizenship.
She's also suspected of sending ricin to five addresses in Texas.
A Canadian police officer at the scene of the search said he couldn't say where in Texas they were sent.
But the police department in Mission, Texas received a suspicious letter within the last week.
The letter to the White House was intercepted at a government mail center.