The US Marshals Service is warning the public to avoid downloading malicious software affecting mobile devices. Disguised as a message from the U-S Marshals, the pop-up malware takes control of the device and populates the screen with a message accusing the user of accessing child pornography. The user is then instructed to pay a fee to avoid prosecution and regain access to their device. Marshalls say do not pay the requested fee. If you believe you are a victim of this scheme, report the incident to your mobile phone carrier, or the FBI.