A Montreal woman is expected in a Buffalo, NY court today accused of sending envelopes containing the poison ricin to the White House and other locations in Texas.
Officials says the letter going to President Trump was intercepted before it reached the White House.
She was arrested trying to cross into Buffalo via the Peace Bridge.
The woman's identity has not been released but mounties raided her home yesterday in Montreal.
The RCMP's Chemical, Biological, Radiological, Nuclear, Explosives team is leading the operation with support from local police and firefighters.