The Mexican Interior Minister Miguel Angel Osorio Chong says 14 people were killed in an explosion at Mexican oil giant Pemex's Mexico City headquarters and 80 were injured, reports Reuters.
The death toll could still rise, he told local television.
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Former Conservative cabinet minister Lord Mayhew has died aged 86, his family has said.
Today's showery weather to mostly die out during the evening, only for rain spreading eastwards from the morning.
Thousands of people have attended celebrations around the country to mark Armed Forces Day.