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The strike at General Motors Co.’s U.S. operations is far from settled, according to the union, casting a darker cloud over a carmaker watching losses pile up and the impact of the walkout spread, according to Bloomberg report. Only three GM assembly plants are still running in North America, said Dan Flores, a company spokesman.

In a letter United Auto Workers Vice President Terry Dittes said GM made a proposal the night before, but told members the offer “did not satisfy your contract demands or needs.” The UAW made the letter public just after the automaker announced it was forced to shut down a plant in Mexico making highly lucrative pickups.

“Regardless of what is publicized in print or social media, etc., there are still many important issues that remain unresolved,” Dittes wrote.

GM’s latest bid for a four-year labor deal fell short on job security, health care benefits, wages and how to manage temporary workers and skilled trades employees, the letter said. The union made a counter proposal and is waiting for GM’s response.

A GM spokesman responded by saying the company will “continue to negotiate and exchange proposals, and remain committed to reaching an agreement that builds a stronger future for our employees and our company.”

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