A deadly blast at the headquarters of the Mexican oil company Pemex was caused by a build-up of gas, the attorney general has said.
Jesus Murillo Karam said no traces of explosives were found at the site in Mexico City.
He said experts believed an electrical fault had caused a spark that detonated the leaking gas last Thursday.
http://www.bbc.co.uk/news/world-latin-america-21332204
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