CHICAGO -- Chicago police are warning people on the city's Northwest Side about a string of armed robberies on the 606 Trail.
The most recent robbery happened at about 4:30 a.m. Sunday in the 1800 block of North Ridgeway.
Police say the victim in Sunday's robbery was approached by two robbers on bikes who were armed with a handgun.
The men then beat the victim and demanded his belongings.
There were two other armed robberies on the trail -- one on Saturday afternoon and a third on July 2.
The robbers are described as young black males who are riding bikes. One wearing a do-rag, a brown long-sleeved shirt and black shorts. The other male with short hair, wearing a white T-shirt and jeans.
There are surveillance cameras at each entry point, but no surveillance photos have been released.
Anyone with information is asked to call Area North detectives at: 312-744-8263.