All clear given after Pemex headquarters evacuation in Mexico

 Mexican soldiers arrive at the headquarters of Mexican oil giant Pemex, following an explosion in February.

Story highlights

  • Pemex is Mexico's powerful and much-criticized state oil monopoly.
  • An explosion at Pemex headquarters in February killed 37 people
  • Thousands of people work at the company's headquarters

The headquarters of Mexico's state oil was evacuated Tuesday night -- but it turned out to be a false alarm, the company said.

The Pemex Tower in Mexico City was cleared after an unspecified threat, Pemex said on its Twitter feed.

A short time later, the company tweeted, "It was a false alarm."

In February, a deadly explosion at Pemex headquarters killed at least 37 people. Officials said it was caused by a buildup of gas in the basement.

Pemex is Mexico's powerful and much-criticized state oil monopoly.

Thousands of people work at the company's headquarters, which includes a 54-story building. The annex where the February explosion happened is adjacent to the tower.