Call it a case of instant car-ma.

A trio of armed robbers were ransacking a check-cashing business in Colorado when another crook used the opportunity to swipe their getaway car, police said.

The incident unfolded around 11 am Saturday at the Hi Lo Check Cashing on Monaco Street in the Denver suburb of Commerce City.

While the masked bandits were busy looting the storefront, they ended up being on the receiving end of what the Commerce City Police Department gleefully described as an “unexpected and ironic twist.”

“A fourth criminal stole their getaway vehicle,” cops crowed in a Facebook post brimming with schadenfreude.

Police noted that the vehicle may have already been stolen.

“We don’t know,” the investigators admitted. “If we get a solid description of it, we will release that here.”

Two of the suspects in the armed robbery were quickly chased down and arrested by officers who raced to the scene. A third remained at large.

No one was injured as a result of the brazen daytime heist, police said.