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SEOUL, South Korea (AP) _ A South Korean air force helicopter crashed Thursday in bad weather in central South Korea, killing all five occupants, including four officers, officials said.

The French-made AS-332 chopper was on a routine training mission when it went down on a mountaintop near Gwesan, 100 miles south of Seoul, shortly before noon, the air force said.

The five killed were three air force majors, one captain and one staff sergeant.

It was raining in the area when the accident occurred. The cause of the crash was being investigated, officials said.