At least six people were injured in a mass shooting at a Halloween party Saturday night near the University of Delaware — sending costumed college kids fleeing in the chaos. Cops were called to a crowded stretch of downtown Newark, Del., shortly after 11 p.m. Witnesses said Main Street was packed with people celebrating Halloween when multiple shots were fired, sending the terrified crowd scattering. “People were running, screaming. They had helicopters in the sky flashing lights on people,” witness Jayden Ngalim told NBC Philadelphia. “The people were speeding down the road. It got chaotic like quick,” he added. Another...