The helicopter, which was carrying Mexico's interior minister and the state governor, crashed on top of two vans in an open field while trying to land in Santiago Jamiltepec after a tour of damage from a powerful earthquake on Friday, officials said.
The senior officials survived but 12 people at the scene were killed and another died later in a hospital, Oaxaca's attorney general's office said in a statement. Fifteen more people were injured.
The 7.2 magnitude quake left nearly a million homes and businesses without power in Mexico City and the south and damaged at least 50 homes in Oaxaca.
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