A number of people have reportedly been injured in an explosion at the Mexico City skyscraper that serves as the offices of Pemex, the state-owned oil monopoly. Details right now are scarce, but the company confirmed via Twitter that people were injured on the ground floor and mezzanine level of the building. According to Telemundo, the explosion was caused by an electrical issue.

Reuters is reporting that one person has died and at least 20 more were injured, but those numbers have not been officially confirmed and will surely become more accurate as the night wears on. On Sept. 12 of last year, at least 30 died after an explosion at a Pemex plant in Northern Mexico.

Pemex, or Petróleos Mexicanos, is one of the most valuable enterprises in the world. We'll update this story throughout the night.

UPDATE: The AP is reporting that 14 people have died and 80 have been injured. Those numbers may also not be final, as people are still believed to be trapped in the rubble.

[via Reuters, image of firefighters at Pemex blast site via AP]