LANCASTER â€“ Lancaster Police are searching for an endangered juvenile. Police say 24-year-old Alexander Ramos-Pacheco of Lancaster has been involved in an online relationship with a 15-year-old girl and may have traveled to Chicago to pick up the girl and bring her back to Lancaster sometime between April 3rd and 6th. 15-year-old Sheralym Mercado was reported missing to Chicago Police on April 2nd and was seen in the company of Pacheco. Police are in possession of one of Pachecoâ€™s vehicles and have spoken to several people who have seen him with the girl over the past few days. Pacheco has expressed his dislike of and made threats against law enforcement. Pacheco may be driving a 2000 Ford Windstar with PA registration HZT-4646. Photos of Pacheco and the missing girl can be seen below. Anyone with information on their whereabouts should call Lancaster Police at 735-3300.