Chicago police are investigating three armored truck robberies that occurred just hours apart Wednesday.

The back-to-back-to-back incidents occurred in Chicago, Lansing and Calumet City.

According to the Chicago Police Department, at approximately 1:20 p.m., two unknown suspects approached a male victim unloading a Brink's armored truck

Police told Fox News Digital that the two suspects pulled out guns and demanded the victim's vehicle.

Armored trucks

Police responded to reports of an armed robbery in Chicago on Wednesday afternoon. Police said that two armed suspects demanded that the driver of the Brink's armored truck get out of the truck while the thieves stole $400,000. (FOX 32 Chicago)

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A witness said that one of the suspects held the driver at gunpoint while the other removed boxes of money from the armored vehicle.

"The man took out a bag and two really, really, big boxes of money," the witness told FOX 32 Chicago.

Suspects

Images of the two suspects in the armed robbery in Chicago on Wednesday, April 12. (FOX 32 Chicago)

The two thieves stole approximately $400,000 from the armored truck, before being intercepted by authorities, FOX 32 Chicago confirmed.

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The male suspects fled the scene of the crime with the Brink's truck, but only made it a few miles away before Chicago police intercepted them.

Armored truck

Aerial view of the armed robbery in Calumet City, a suburb of Chicago, Illinois. (FOX 32 Chicago)

Earlier in the day, police responded to two similar robberies in Lansing and Calumet City.

At 9:30 a.m., at a Pete's Fresh Market in Calumet City, another armored truck was robbed. 

According to FOX 32 Chicago, there were multiple offenders involved. 

Meanwhile, in the Chicago suburb of Lansing, another robbery involving a Brink's truck occurred. 

Police have not released details of the incident, or how much money was stolen. 

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It's not yet known if the robberies are related.