Gold Rush: Armed Robbers Steal $4M in Gold From Truck The truck carrying millions-worth of gold experienced mechanical problems.

 -- Three armed suspects are on the run after allegedly robbing a tractor trailer that was transporting a shipment of millions of dollars worth of gold and silver, police said.

Two armed security security guards told police they were traveling from Miami to Attleboro, Massachusetts along I-95 and pulled over in eastern North Carolina after experiencing mechanical problems, according to the Wilson County Sheriff's Office.

The pair was approached by three armed men driving a white van who ordered the men onto the ground, tied their hands behind their backs and made them walk into the woods, police said.

During that time, the suspects allegedly took gold and silver estimated to be worth more than $4,000,000, police said.

The security guards worked for TransValue Inc., a Florida-based shipping security company that ships goods for companies and banks working within the precious metals industry. The company's CEO Jesus Rodriguez confirmed the robbery to ABC News and said that an internal investigation is underway.

Rodriguez told ABC News there is now a $50,000 reward for information that leads to an arrest or recovery of the stolen property.

The FBI has been contacted and the investigation is ongoing.

ABC News' Janice McDonald contributed to this report.