A post office box in the United States (illustrative image).
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Robyn Beck / AFP
In the United States, a woman has been arrested on suspicion of being involved in sending a poisoned envelope to Donald Trump.
The mysterious fold contained ricin, a deadly substance, authorities said on Sunday.
"I confirm that an arrest was made at the Peace Bridge in Buffalo, New York," customs official Aaron Bowker told AFP in reference to a bridge that connects Canada to New York State .
"The investigation is ongoing," he added.
The suspect is a woman who was carrying a gun when she was arrested, according to US media.
Several tests confirmed the presence of poison
A government official told AFP, on condition of anonymity, that a court appearance was scheduled for Monday.
The American press had let it be known on Saturday that the authorities had intercepted an envelope containing ricin and addressed to Donald Trump.
The letter had been discovered earlier in the week and had not made it to the White House, according to the
New York Times
daily
and CNN television.
The newspaper claims the letter was mailed from Canada.
Mail addressed to the White House is first inspected and then sorted in depots near Washington.
According to CNN, the contents of the envelope were tested several times in one of these repositories, with confirmation of the presence of ricin.
Ricin, which is produced by processing castor beans, is fatal even in tiny doses if swallowed, inhaled, or injected, causing organ failure.
There is no antidote.
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