An 18-year-old was shot early Saturday while walking down an Allentown street, city police said. The shooting happened around 4 a.m. in the 600 block of Park Street. Allentown Police Capt. Michael Becker said the teen was walking in the vicinity of Seventh and Allen streets, when he heard a shot ring out. As he ran toward a house, he realized he was struck by a bullet, Becker said.