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NEW YORK — The imam of a London mosque used his influential position in the late 1990s to train and aid terrorists and used the cover of his religion to hide in plain sight, a prosecutor told jurors in his opening statement Thursday before a defense attorney promised that the defendant will explain himself during the trial.

Assistant U.S. Attorney Edward Kim described Mustafa Kamel Mustafa in starkly different terms than did defense attorney Joshua Dratel, even referring to him by a different name, his alias Abu Hamza, as he told how Mustafa led of a large London mosque with hundreds of followers and engaged in a "global campaign to spread terror."

"Abu Hamza was not just a preacher of religion," Kim said. "He was a trainer of terrorists and he used the cover of religion so he could hide in plain sight in London."

Radical Muslim cleric Mustafa Kamel Mustafa prays in a street outside his Mosque in north London on March 28, 2003.Alastair Grant / AP, file

The prosecutor said Mustafa, 55, arranged satellite communications for kidnappers in Yemen in a 1998 attack that killed four people, directed others to set up an al-Qaeda training camp in Bly, Ore., in late 1999 and early 2000, and arranged for fighters to attend an Afghanistan al-Qaeda training camp.

But Dratel told jurors his client had never harmed Americans and did not participate in any of the acts charged in the case."Mr. Mustafa has not been hiding in a cave," he said. "He's an open book. It's not a secret conspiracy." He said Mustafa, extradited from England in 2012, would tell his own story when he testifies, and he cautioned jurors that they might not agree with some of his opinions. "He said a lot of harsh things," Dratel said.

"These are views, not acts. This is expression, not crimes. He needed to be outrageous to an extent to reach the entire spectrum of his community and keep them in the conversation. He couldn't walk a road that left him without access to extremists on one side of the other."

Mustafa has just one eye and no hands — he's said he lost them fighting the Soviet Union with the mujaheddin in Afghanistan.

The trial is expected to last about a month.

— The Associated Press