Zazi , an immigrant from Pakistan , and Zarein Ahmedzay , an immigrant from Afghanistan , have already pleaded guilty to terror charges . Confessed subway bomb plotter Najibullah Zazi testifies against alleged co-conspirator . The former New York City transit police officer is accused of trying to detonate a homemade explosive device on the subway, but he says it was an elaborate ruse and that his confession came after months in which Adis Medunjanin is the only member of the trio on trial ; the other two pleaded guilty .
Confessed subway bomb plotter Najibullah Zazi testifies against alleged co-conspirator . The former New York City transit police officer is accused of trying to detonate a homemade explosive device on the subway, but he says it was an elaborate ruse and that his confession came after months in which Adis Medunjanin is the only member of the trio on trial ; the other two pleaded guilty .