Mexican authorities have begun an investigation into a fatal helicopter crash after Friday’s devastating earthquake in the southern state of Oaxaca.

Officials say a dust cloud caused the pilot to lose control, keel over and crash into an open field where local residents had set up camp for the night because they feared aftershocks could cause their homes to collapse.

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Authorities said 14 people were killed in all — up from an earlier toll of 13 — including a six-month-old baby and a 10-year-old girl.

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All victims in the accident were on the ground.

Inside the helicopter, Interior Minister Alfonso Navarrete and Oaxaca state Governor Alejandro Murat were unharmed.