A man arrested for allegedly placing a backpack he thought contained a bomb near Chicago's Wrigley Field got the fake explosive from an FBI undercover agent, authorities say , a tactic that has been used in other U.S. terrorism cases in recent years.
It wouldn't be the first time FBI agents have posed as terror operatives and supplied suspects with bogus explosives. Last year, authorities arrested a Jordanian national after he allegedly attempted to detonate what he thought was a bomb outside a Dallas skyscraper. In an unrelated case, authorities in Springfield, Ill., arrested another man after he allegedly tried to set off what he thought was explosives in a van outside a federal courthouse.