Suspicious': Potentially Big Twist in Brazen Highway Robbery of $4 Million Worth of Gold

Detectives suspect that a brazen highway robbery where approximately $4 million in gold was stolen was an "inside job," according to a search warrant application obtained by ABC News.

"The fact that the truck was robbed immediately upon it pulling over at an unannounced stop is suspicious in and of itself," a Wilson County Sheriff’s Office detective wrote. "It is also suspicious because there are no markings on the side of the truck that would indicate the type of cargo contained therein. The suspects also went directly to the trailer and found the gold which was in unmarked five gallon buckets. It is not believed that this is a random act due to the nature and facts of this robbery."

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Three armed men stole approximately $4 million in gold on Sunday on an interstate highway, where two armed TrasValue Inc. guards said their armored truck experienced mechanical problems on I-95 that forced them to pull over.

But according to warrants released Wednesday, WTVD-TV reports, one of the passengers said they actually pulled over because he was feeling sick. Moreover, a mechanic looked at the vehicle and didn't find anything wrong.

Sheriff Calvin Woodard Jr. said during a press conference said detectives are still examining all of the possibilities, and he will not conclusively state that it was an inside job.

"We're unable to say if it's suspicious or not suspicious at this time," he said.

The guards said the men tied their hands behind their backs and made them walk straight into the woods after ambushing the vehicle, according to authorities. The men then took the gold and some silver and fled the scene, police said.

The guards were transporting the gold from Miami, Florida, to “Jewelry City” in Attleboro, Massachusetts, NECN-TV reported.

A $50,000 reward is being offered for information leading to an arrest or the stolen valuables.