A massive search for a 6-year-old Tucson, Ariz., girl who vanished Friday night resumed Sunday morning. Scores of police, FBI agents and deputy U.S. marshals combed the city’s east side for first-grader Isabel Mercedes Celis. Officials tried to determine if the girl was kidnapped or just wandered off. Isabel’s parents last saw her in bed at 11 p.m. Friday, and they discovered her missing when they woke up around 8 a.m. Saturday, Tucson police spokeswoman Sgt. Maria Hawke said.