Five men have been convicted in Miami of plotting to blow up the Sears tower in Chicago and carry out attacks on several other US targets, BBC reported.
Prosecutors say the men conspired to provide material support to al-Qaeda, with the aim of blowing up the tower and several federal government offices.
A sixth man was acquitted of all charges. It was the third trial for the men, who were arrested in 2006.
Previous juries were unable to agree on whether their plot was genuine.
In the earlier trials, a seventh man was also acquitted of all of the charges he faced.