Residents in Northern Colorado have been calling police after they received child sexual abuse material in the mail last week. Greeley Police says the illegal images, known as "CSAM," were mailed to residents through the United States Postal Service.

Greeley Police tells CBS News Colorado they started receiving reports on September 3rd, with multiple residents saying they found the illegal images in their mailboxes. Police say the illegal content appears to have been mailed from Canada and did not include a return address.

However, the explicit material was also paired with threats to report the recipients to the FBI and Department of Homeland Security for possession of illegal images. The threats also gave residents guidelines on how they could use cryptocurrency to pay someone in excha

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