As training ramps up ahead of the Chicago Marathon, runners are being warned to take extra caution along the lakefront.



Several runners have reported they were attacked on the lakefront path by a roller blader who threw punches and elbows or grabbed them around Navy Pier and Monroe Harbor.



The Chicago Area Runners Association posted a warning on its Facebook page urging runners to be on the lookout and asking previous victims to file a police report.



The suspect is described as a man between 50 and 60 years old, standing around 6-foot-3 possibly with gray hair.



"Please report any incidents like this," CARA posted. "When police have a report, they can do more to help keep runners safe!"



The Bank of America Chicago Marathon steps off Oct. 7.