Threatening letters claiming to contain lethal 'pathogens' have been sent to lawmakers and high-profile media personalities across America, it has emerged.
Police revealed that more than 100 letters containing a powdery substance have been dispatched to senators and various media companies, including The New York Times, Fox News and National Public Radio.
Well-known public media figures who have received the letters, believed to have originated from a sender in Oregon, include Jon Stewart of The Daily Show and Stephen Colbert of The Colbert Report.
Mr Colbert only recently returned to his show this week after cancelling filming last week to be with his ailing 91-year-old mother Lorna Colbert.
Speaker of the House of Representatives, John Boehner, also received a letter containing a white substance at one of his district offices, but the powder proved to be harmless. Read More