DETROIT -

Police are working to track down two men posing as officers.

Early Sunday evening, the men allegedly pistol-whipped customers pumping gas at the Citgo gas station near I-94 and French Rd. on Detroit's east side.  They took off with the victims' cash and cell phones.

The suspects are described as white men about 30 years old, driving a black Ford 150.  They had police badges, guns and bullet-proof vests.

Investigators believe these men may be responsible for another recent robbery in the city, where crooks posing as officers targeted innocent people.

In that case, a man was pulled over on Harper Ave. near 3 Mile Dr.  Three men, two white and one black, exited the unmarked Crown Victoria.  As the victim answered questions from one of the men posing as a police officer, the other two rifled through the victims car, stealing his wallet and CD's.

Detroit Police are now warning citizens that is someone approaches you identifying themselves as a police officer and something doesn't feel right, call the police yourself.