Story highlights

The crash occurs Friday

The 12 killed were returning back from training

Authorities find two survivors

CNN  — 

A Brunei air force helicopter crashed, killing 12 military officials returning back from training, authorities in the southeast Asian nation said Saturday.

The crash occurred Friday, a military statement said.

Authorities searched for the victims after the crash and found two survivors, who were rushed to a hospital.

All personnel involved are accounted for, the military said.

The crash occurred in the area of Kuala Belait, in a western part of the nation. Brunei is a sultanate on Borneo island.

Relatives and officers from the defense ministry held prayers for the victims.

Officials did not provide information on what caused the crash.

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CNN’s Karen Smith contributed to this report.