HAVANA - Rescuers combed through what remained of a luxury Havana hotel Saturday, as the death toll after a powerful blast due to a suspected gas leak climbed to 27, authorities said. No survivors were found in the upper floors of the prestigious Saratoga Hotel, and rescuers said they were now concentrating their efforts on the jumbled debris filling the two-level basement of the neoclassical building. Authorities reported Saturday that 37 people had been hospitalized, down from an earlier number of 46. There was meanwhile some confusion after a Red Cross official gave a death toll of 32, but the higher number was later reported to be “an error.”  The hotel had been closed for business during renovation work, and many victims of Friday’s explosion were either construction workers or hotel employees preparing for its reopening. But a 29-year-old Spanish tourist, who had been walking nearby, died in the blast.