A plan by Vietnam to increase tariffs on imported car parts will hurt a small sector that already faces modest sales and overcapacity, an executive of General Motors which has a venture in the country, told Reuters. The news agency said that, in the first public comments from GM on an issue that has riled other foreign car makers, William Botwick, executive director of GM's ASEAN operations, said that if the hike goes through, "it will be devastating to the automotive industry in Vietnam."