(CNN) A military helicopter carrying officials surveying earthquake damage crashed Friday night in the southeastern Mexican state of Oaxaca, killing 13 people, Mexican officials said.

The helicopter was attempting to land at an airfield in Santiago Jamiltepec when it crashed in a nearby field on top of two vehicles, a spokeswoman for the Oaxaca attorney general's office told CNN.

The 13 who were killed were all on the ground, spokeswoman Lizbeth Hernandez Bravo said.

Twelve died at the crash site, while one died later at the hospital, the state attorney general's office said. Three of the dead were children, the office said. Fifteen others were injured.

The helicopter was surveying the damage from the quake, and was carrying Mexican Interior Minister Alfonso Navarrete Prida and Oaxaca's governor, Alejandro Murat. Both men survived and only suffered "slight concussions," the Interior Ministry tweeted.

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