Police are investigating a series of armed robberies in Center City Philadelphia, all involving suspects armed with AR-15-style rifles. Recently, three victims were robbed at gunpoint by masked men over the weekend. The police have connected these incidents to a troubling pattern of similar attacks, prompting a search for at least four suspects linked to the crimes. Witnesses describe the terrifying moments during the robberies, with one victim fearing for his life. Authorities continue to gather evidence, including surveillance footage, and are urging anyone with information to come forward.