NEW YORK - US law enforcement agents flew terrorism suspect Najibullah Zazi, an Afghan national, back to New York the other day, hours after a prosecutor alleged he had planned a Sept 11 attack. Zazi, who was arrested last weekend in Denver, Colorado, landed at New Jerseys Teterboro Airport about 5:45pm, and New York police transported him by helicopter into the city, the New York Daily News reported. At a court hearing in Denver Friday, Tim Neff, an assistant US attorney, said Zazi planned to detonate a hydrogen peroxide bomb in New York on the anniversary of the 2001 terror attacks, the Denver Post reported. The evidence suggests a chilling, disturbing sequence of events showing the defendant was intent on making a bomb and being in New York on 9/11 for purposes of perhaps using such items, Neff said. Federal Magistrate Judge Craig Shaffer ordered Zazi, 24, to be transferred to New York to face charges of conspiring to use weapons of mass destruction. In court documents, FBI agents said they found bomb-making instructions on a laptop computer found inside a car rented by Zazi, 24, for a cross-country trip that ended in New York Sept 9. Prosecutors also allege Zazi had travelled overseas to receive bomb-making instructions and bought materials needed to make a bomb. Authorities allege Zazi fled to Colorado by airplane after being tipped off about the FBIs investigation. He was arrested in Aurora, Colorado, last Saturday. Zazis attorney, Art Folsom, insists the fact no explosion took place in New York Sept 11 is evidence his client is innocent, the Post reported. He was there on Sept. 11 the entire time on Sept. 11 and nothing happened, Folsom said.