TEXAS — A woman who was taken into custody at the New York-Canada border, accused of mailing ricin to the White House, may have sent the deadly toxin to Texas law enforcement, reports indicate.

An envelope containing the poison was last week intercepted en route to the White House. The suspect, who was not immediately identified, was taken into custody by U.S. Customs and Border Protections officers at the Peace Bridge border crossing, which is located near Buffalo.

RELATED: Reports: White House Ricin Suspect Arrested at U.S.-Canada Border

The letter appeared to have originated in Canada and was addressed to President Donald Trump. It was intercepted at a facility that screens mail addressed to the president and the White House and tested positive for the substance.

It has now come to light that envelopes containing ricin were mailed to law enforcement agencies in South Texas and the Rio Grande Valley.

On Monday, Hidalgo County Sheriff Eddie Guerra tweeted that envelopes containing ricin were mailed to him and three members of his detention staff. He stated there were no injuries.

It is believed that the envelopes could have been mailed by the same suspect. An investigation is ongoing.

The Associated Press contributed to this report.