An explosion at the Mexico City headquarters of the state-run Pemex oil company has killed at least 14 people and injured 80 others.
Mexico's interior ministry and Pemex confirmed the casualty report.
Rescuers are searching for people who may still be trapped in the smoldering tower.
Video from the Mexican capital showed debris covering the ground and smoke streaming from the lower floors of the scorched building.
There is no word on what caused the blast, but officials say equipment problems in the basement may have been responsible. The building's electricity had gone out earlier in the day