The Brief Chicago police are warning of a series of armed robberies targeting businesses in the South Loop and Pilsen areas. In each case, suspects waited for unattended registers, grabbed them, and fled; some also took food orders before escaping. The suspects are described as teens, and police urge the public to stay alert and report suspicious activity as investigations continue. Chicago Police are warning the public of a string of recent armed robberies in the South Loop and Pilsen neighborhoods. Anyone with information should contact Area Three Detectives at 312-744-8263 or submit an anonymous tip at CPDTIP.com and use reference # P26-3-002.