Abid Naseer, taking the stand in his own defense, told a jury in Brooklyn federal court that he was posing as a woman to meet other women in a Yahoo chatroom in November 2008 when he connected with another man also posing as a woman.
Prosecutors charge Naseer was actually communicating with an al-Qaida handler who communicated from the same email account with Najibullah Zazi, who pleaded guilty in 2010 to plotting to bomb the city's subway system.
The government alleges Naseer headed an al-Qaida cell in the United Kingdom that was part of a larger conspiracy by the terror group to carry out attacks in Denmark and New York City. He faces life in prison if convicted. He was extradited to New York in 2013.
Questioned by a court-appointed adviser, Naseer denied emails mentioning a nikah, or Islamic wedding, specific female names and a ceremony to take place on Easter weekend 2009 were coded to disguise a forthcoming plot.
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Naseer testified he never learned the true identity of Sohaib because the Internet is meant to be anonymous.
"In the Internet world it's very rare to know real identities," he said. "The Internet is a world where you have multiple identities."