Why you should call 911 if you get pulled over in Mississippi [w/video]

It sounds like an urban legend: A serial killer posing as a police officer pulling over motorists and then murdering them in their vehicles on the side of the highway. But this is no hoax, as the Mississippi Bureau of Investigation is on the hunt for a suspect after discovering two such victims, according to CNN.

The shootings both took place last week, on two separate roadways some 88 kilometers (55 miles) apart, according to the report. Police say the victims were not acquainted.

Authorities in Mississippi are advising motorists to be cautious if they're pulled over, and to call 911 to verify that the police officer is legitimate. Pulling over into a well-lit, well-populated area is also advised.

Click here to watch CNN's report on the Mississippi killings.