Canada Police Say Six Ricin-Filled Letters Sent to U.S., Including to White House

Police officers block a street leading to a condo building related to an investigation into the ricin-filled envelope sent to the White House, as the Royal Canadian Mounted Police (RCMP) Chemical, Biological, Radiological, Nuclear, Explosives team checks the area in Longueuil, Quebec, Canada on September 21, 2020. Reuters/Christinne Muschi

LONGUEUIL, Quebec—Canadian police on Monday searched an apartment in a Montreal suburb that is linked to the woman arrested for sending a ricin-filled envelope to the White House and to five other addresses in Texas, the Royal Canadian Mounted Police (RCMP) said.

U.S. authorities arrested a woman at the U.S.-Canada border near Buffalo, New York, on Sunday on suspicion that she sent the deadly poison by mail, addressed to the White House. The woman has joint Canadian and French citizenship, two sources said on Monday.