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By Lizbeth Diaz and Joanna Zuckerman Bernstein MEXICO CITY (Reuters) - A gas truck explosion decimated large parts of a maternity hospital on the western edge of Mexico City on Thursday, killing one woman and a child and leaving dozens injured, Mexico City Mayor Miguel Angel Mancera said. The head of national emergency services earlier said that seven people had died, but the death toll was revised down by Mancera, who said there had been confusion around the number. Mancera said the explosion destroyed around 70 percent of the maternity hospital and left 66 people injured, 22 of them seriously. Three people have been detained for their roles in the gas truck explosion, and two of them have been hospitalized, he said.