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International agencies had alerted Kosovo authorities that Sami Osmakac could be linked to Islamist extremists, the official told the Associated Press.

He said the 25-year-old, an ethnic Albanian and naturalized U.S. citizen, discussed “issues in support of radical elements” with the individuals he met.

U.S. authorities say Mr. Osmakac planned to use a car bomb and other weapons in an Islamist-inspired attack in the Tampa area of Florida.

He was arrested Saturday - the day officials said he was planning his attack - after he allegedly bought explosive devices and firearms from an undercover agent. The items were disabled before the sale.