UPDATE 1-Taiwan top military official missing after helicopter made emergency landing

Taiwan's top military official is missing after a helicopter made an emergency landing in northern Taiwan, the island's defence ministry said on Thursday.

The defence ministry said a rescue mission was underway for the 13 people on board the black hawk helicopter, which includes the Air Force General Shen Yi-ming, the island's chief of the general staff. There people were still missing, including Shen, while several people were found alive, the ministry said, adding that a team has been dispatched for the rescue mission.

The crash came a week before a key election on Jan. 11, when the democratic island is set to hold presidential and parliamentary elections. 

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