Police searching for person in clown mask after Pennsylvania teen fatally stabbed Published September 26, 2016 FoxNews.com Facebook Twitter Email Print (Google Maps) Police in eastern Pennsylvania are trying to figure out who stabbed a 16-year-old to death during a fight that broke out after a person showed up wearing a clown mask. Authorities said the incident happened Sunday night around 8:30 p.m. in Reading, located about 50 miles northwest of Philadelphia.