A woman suspected of sending a letter containing the poison ricin to President Donald Trump has been arrested as she tried to enter the US from Canada at a border crossing in New York state, a US law enforcement official has said.

It was  previously reported that law enforcement had intercepted a ricin package sent to Trump last week, according to two law enforcement officials, and that investigators were looking into the possibility that it came from Canada.

Authorities are investigating additional similar packages mailed to addresses in Texas that may be connected to the same sender in Canada, according to a US law enforcement official.

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