The unidentified suspect was arrested in Ohio over the weekend.
ABC News has learned the plot involved detonating a bomb around Independence Day, but that's all they're revealing at this time.
VIDEO: FBI discusses arrest in connection to terror attack planned for Fourth of July in Cleveland
During a press conference Monday, FBI officials said the "suspect conducted surveillance in Cleveland and also expressed interest in chopping off heads and hands and disposing of bodies.'
FBI Agent Vicki Anderson says the individual was arrested for "attempted material support of a foreign terrorist organization."
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