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BROOKS COUNTY, Texas (KVEO) — The number of people receiving poison ricin from a Canadian woman continues to rise.

On Wednesday, the Brooks County Sheriff’s Department released a statement that an envelope addressed to Brooks County Sheriff Ubino “Benny” Martinez contained a suspicous powdery substance that investigators believe is ricin.

Investigators have linked Pascale Ferrier, 53, to the letter from a forensic examination conducted by the FBI.

Ferrier is in federal custody for sending ricin to President Donald Trump and Hidalgo County Sheriff Eddie Guerra.

She was arrested near the U.S./Canada border in Buffalo, New York on Sunday. Ferrier was found with a knife and gun when arrested.

In 2019, Ferrier was deported to Canada after being charged for weapon possession charges in Hidalgo County.