A masked gunman robbed a Niles gas station of an undisclosed amount of cash Monday night, police said.
The robbery was reported at the Marathon gas station at Dempster Street and Harlem Avenue.
According to police, a store employee reported that a man wearing a black stocking cap and black face mask entered the station at around 8:40 p.m., pointed a handgun and demanded money from the cash register.
The robber put the money into a bag and ran away from the gas station, police said.
It was not immediately known how much money was taken, Niles police said.
Anyone with information is asked to contact the Niles Police Department Detective Bureau at 847-588-6570.
On Saturday, a robbery was attempted at another Marathon gas station about 1.5 miles away in in Morton Grove, police said.
According to police, a man with a knife demanded money from the cash register but ended up leaving empty-handed when the employee did not comply.
jjohnson@chicagotribune.com
Twitter: @Jen_Tribune