Last updated: 23 february, 2010 - 12:45 GMT
New York bomb plotter pleads guilty
Najibullah Zazi told the court he bought large amounts of cosmetics to make explosives
An Afghan immigrant bus driver has pleaded guilty to plotting to set off home-made bombs on the New York subway system.
Najibullah Zazi told a federal court in New York that he was recruited and trained by al-Qaeda to carry out an 'act of martyrdom' in protest at the war in Afghanistan.
The 25-year-old Zazi was arrested in September last year at his home in Denver, Colorado, where bomb-making instructions were found.
The plot was described by US Attorney General Eric Holder as one of the most "serious terrorist threats" to the United States since September 2001.
Rick Nelson is a counter-terrorism expert at the Centre for Strategic and International Studies.
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First broadcast 23 February 2010
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