⁍ Canadian police on Monday searched an apartment in a Montreal suburb linked to the woman arrested for sending a ricin-filled envelope to the White House.

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⁍ 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.

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⁍ Ricin can cause death within 36 to 72 hours from exposure to an amount as small as a pinhead.

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– A Canadian woman has been arrested in connection with ricin-laced letters sent to the White House and five addresses in Texas, Reuters reports. The woman, who has not been identified, was arrested at the US-Canada border near Buffalo, New York, on Sunday. A Royal Canadian Mounted Police officer says a search of the woman’s Montreal-area apartment is underway. “We believe a total of six letters were sent, one to the White House and five to Texas,” the officer says. “We can’t confirm that she lived in (the apartment), but it is connected to her.” The FBI is investigating several suspected ricin letters sent to law enforcement and detention facilities in South Texas, a US law enforcement source tells Reuters. So far they have not found any link to political or terrorist groups, but the investigation is ongoing. The RCMP’s special Chemical, Biological, Radiological, Nuclear, Explosives team is leading the operation. On Saturday, the RCMP confirmed the White House letter had apparently been sent from Canada and said the FBI had requested assistance. The envelope was intercepted at a government mail center before it arrived at the White House. Ricin is found naturally in castor beans but it takes a deliberate act to convert it into a biological weapon. Ricin can cause death within 36 to 72 hours from exposure to an amount as small as a pinhead. No known antidote exists.