'Suspicious letter' addressed to Obama is intercepted

A suspicious letter sent to US President Barack Obama has been intercepted at a mail screening facility, Reuters reports.

President Barack Obama. Credit: Dennis Brack/ABACA USA/Empics Entertainment

The letter addresses to Obama, contained a "suspicious substance" authorities have told NBC News.

"A letter addressed to the president was received at a remote screening facility containing a suspicious substance. We are working closely with Capitol Police and the FBI in this investigation," a Secret Service spokesman said.

It comes as it was reported that two letters containing the poison ricin were sent to the US Senate yesterday and today.

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