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In this September 25, 2009 file photo, Najibullah Zazi (centre) is escorted off an NYPD helicopter by US Marshals after being extradited from Denver, Colorado. Image Credit: AP/New York City Police Department

New York: A former airport shuttle driver accused of buying beauty supplies to make bombs for an attack on New York City subways has pleaded guilty, admitting he agreed to conduct an Al Qaida-led "martyrdom operation" because of US involvement in his native Afghanistan.

Najibullah Zazi told a judge the terror network recruited him to be a suicide bomber in New York, where he went to high school and once worked a coffee cart just blocks from the World Trade Center site.

Zazi said in court Monday, "I would sacrifice myself to bring attention to what the US military was doing to civilians in Afghanistan."

The Associated Press learned earlier this month that the jailed Zazi had recently volunteered information about the bomb plot in the first step toward a plea deal.