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The alleged plotters were frustrated that other anti-corporate protesters opposed violence, Dettelbach said.

Federal authorities said their investigation was aided by a convicted criminal who worked as a paid confidential source, made contact with the some of the suspects in October and recorded conversations with them over the past three months.

The men had considered different plots, including trying to bring down financial institution signs in downtown Cleveland or attacking other targets, including a law enforcement center, oil wells, a cargo ship or the opening of a new downtown casino, according to the affidavit. The document also alleges that one suspect talked about being part of group planning to cause trouble during an upcoming NATO summit in Chicago.

Franko reported from Columbus, Ohio. Associated Press writers Barbara Rodriguez in Columbus and Pete Yost in Washington contributed to this report.