The death toll from a powerful explosion in the Mexico City skyscraper complex housing the offices of state oil monopoly Pemex rose to at least 32, company and government officials said Friday.
Twenty men and 12 women were killed, the company said -- while 121 were injured, 52 of whom remain in hospital.
Mexican President Enrique Pea Nieto arrived at the Pemex administration complex by helicopter Thursday night to supervise rescue operations, Pemex and the news agency La Prensa reported. Hundreds of Mexican military forces were sent to the complex to "preserve security," officials told newspaper El Universal.
The explosion took place in the basement garage of the auxiliary building, next to the company's 52-floor tower in a busy commercial and residential area, said Eduardo Snchez, a spokesman for the Interior Ministry.
"They're conducting a tour of the building and the area adjacent to the blast site to verify if there are any still trapped so they can be rescued immediately," Sanchez said Thursday.
A government official, speaking on the condition of anonymity, said preliminary findings suggested the blast was caused by aged boiler exploding in a building next to the tower, Reuters reported.
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