NEW : President Hermosillo travels to Hermosillo to meet with health officials . NEW : Officials believe blaze did not start in center ; attorney general to investigate . NEW : 15 children remained hospitalized , 15 of them in critical condition . 15 child admitted to Sonora in Sacramento , Sacramento .
NEW : President Felipe Calderon travels to Hermosillo to meet with health officials . NEW : Officials believe blaze did not start in center ; attorney general to investigate . NEW : 23 children remained hospitalized , 15 of them in critical condition . One child admitted to Shriners Hospitals in Sacramento , California .