Officers say two of the cases could be related.
Police say the first one happened around 2:00 at Oxford Circle and Cambridge Drive.
Investigators say two men with a handgun demanded money from a man, then ran off.
Then around 3:15, police say two men with a handgun robbed a man on Devonport Drive and ran off.
And police think those two robberies could be connected.
In the third robbery, police say a man with a gun stole someone’s car on Yellowstone Parkway.
They don’t believe that crime is related to the other two.