Kucharek says the pilot flew erratically and did not communicate with the fighter pilots, who intercepted the plane at the Michigan-Wisconsin state line.
Kucharek says the pilot acknowledged seeing the F-16s but did not obey their nonverbal commands to follow them.
He says the plane was not believed to be a terrorist threat.
Still, Department of Justice spokesman Bill Cosh says the state Capitol building in Madison was evacuated as a precaution.
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