A woman has been arrested on suspicions of sending a package containing ricin poison to US President Donald Trump.
The unnamed woman was found at a border crossing in Buffalo, New York, as she tried to enter the US from Canada, and was reportedly carrying a gun.
The letter containing the deadly poison is believed to have come from Canada, according to investigators.
The letter was discovered last week before it could reach the White House.
Ricin, a poison found naturally in castor beans, has been used in other attempted attacks against the White House in recent years.
The Trump administration is yet to comment on the reports.