A packed afternoon ride on a Pittsburgh Regional Transit bus turned into a rolling fight scene Friday when a brawl between teenagers erupted in the aisle and spilled riders out the doors.
Video that circulated online shows the confrontation unfolding from inside the bus, with shouting erupting and at least one punch thrown before a full-on scuffle breaks out. The clash happened in the 300 block of Centre Avenue around 3 p.m., prompting other passengers to clear out as the chaos escalated…