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Prosecutors said the tapes proved the defendants didn’t need prompting by the defendant to launch an attack.

“The FBI did exactly what it’s supposed to do — it caught four dangerous men before they could do any real harm,” Mr. Raskin said. “Ordinary people wouldn’t even dream of what these defendants did.”

Jurors deliberated for more than a week. A judge denied a request for a mistrial last week after a juror came across a document in an evidence binder that shouldn’t have been there. The juror was dismissed.