A robber camouflaged as a security guard hit the jackpot Friday outside Greektown Casino when he stole several bags of loot from an armored truck parked along the curb, making off with more than $500,000, according to Detroit police.

No one was hurt. No weapons were brandished, and no threats were made, police said.

“The FBI has taken the lead on the investigation because it seems to be of a suspicious nature,” Assistant Police Chief Steve Dolunt said without elaborating. “Detroit police are working with the FBI on this heist. We’re still looking at video to see how this person escaped.”

The FBI, through spokeswoman Jill Washburn, confirmed it is investigating the case, but Washburn declined further comment.

The heist happened at around 8 a.m. ET at the intersection of Beaubien Street and Monroe Avenue downtown, police said. A black male wearing a Loomis Armored security guard shirt approached the armored vehicle, took the bags of money out of the back and took off.

The driver of the armored vehicle thought that the thief was a co-worker because he was wearing a uniform shirt, said a source familiar with the case.

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