At least one girl was seriously injured Tuesday as hundreds of students from Dallas and other area school districts again converged on Dallas City Hall. By midday, buses were arriving to pick up the protesters and return them to school. Witnesses said an 18-year-old Spruce High School student's hand was severed when a van of students in which she was riding rolled over at an intersection... ... Meanwhile, hundreds of students streamed off trains at Union Station and marched up Young Street in downtown Dallas, whooping and hollering, waving the Mexican flag and chanting “Si, se puede,” meaning “Yes, we...