Oct 9 (Reuters) - General Motors on Monday said it was laying off nearly 200 additional workers due to the United Auto Workers strike, adding a sixth impacted plant.

The Detroit automaker last week said about 2,100 workers had been impacted by the strike of two of its assembly plants in Missouri and Michigan and 18 parts distribution centers. GM on Monday said about 2,300 workers are now impacted, including 70 layoffs at its Lansing, Michigan, stamping plant and about 70 additional layoffs at a Toledo, Ohio, plant.

GM said workers are not expected to return until the strike is resolved. (Reporting by David Shepardson; Editing by Mark Porter)