(Reuters) – Chicago police arrested a suspect in a fatal shooting that escalated from a fight outside a fast food restaurant and spilled on to a nearby train line, authorities and local media said on Friday. At least two people died and 10 were wounded after gunfire erupted on Thursday night outside a McDonald’s near the city’s Magnificent Mile shopping section, authorities said. A gun was recovered at the crime scene, according to Chicago police spokesperson Tom Ahern. “I was getting off the train and I spotted a group of teens fighting,” Deonna Jackson, who witnessed the incident, told the C…