Lancaster police have charged 18-year-old Arkie Gillis with possession of prohibited firearms and unlawful carrying after a Monday night shooting incident. Officers responded to reports of gunfire on South Queen Street, where surveillance footage showed three individuals exchanging shots. Gillis was apprehended after a brief chase, during which he discarded a backpack containing two untraceable 'ghost guns'—Glock-style firearms with an extended magazine. Two additional suspects, described as males, remain at large. The incident occurred on May 12, 2026, with police actively seeking public assistance to identify the unidentified individuals. Authorities urge anyone with information to contact the Lancaster City Bureau of Police at (717) 735-3300 or submit an anonymous tip via Crimewatch. The investigation continues into the circumstances surrounding the gunfire exchange and the role of the remaining suspects.