Federal agents have charged three men in a terror probe that reaches from Colorado to New York to Pakistan. Najibullah Zazi, an Afghan national and airport shuttle driver, was arrested with his father outside of Denver. Investigators say they found notes in Zazi's handwriting about how to make a bomb, and also found his fingerprints on batteries and a scale that could be used to make explosives. Zazi admitted receiving weapons training from al Qaeda, but denied plotting a terrorist attack. An acquaintance of the two men, Ahmad Wais Afzali, who is from Flushing, New York, was also arrested. All three will appear in court Monday. Officials are investigating several people for a plot to detonate improvised explosive devices in the United States. The plot may have involved a major transportation center, officials said. The three men were picked up for giving federal agents false statements and face up to eight years in prison.