A woman suspected of sending a letter last week to the White House containing the poison ricin was arrested on Sunday at the New York-Canada border, law enforcement officials told CNN and The Associated Press.
U.S. Customs and Border Protection officers took the woman into custody at the Peace Bridge border crossing near Buffalo. One official told CNN the woman was carrying a gun when she was arrested. She is expected to face federal charges.
The letter, which appeared to have originated in Canada, was intercepted at an offsite facility that screens mail sent to the White House, AP reports. During a preliminary investigation, the envelope tested positive for ricin.