Unifor, a general trade union in Canada, said its members at General Motor's (GM) CAMI auto manufacturing plant in Ingersoll, Ontario, have gone on strike after talks on a tentative agreement broke down, Reuters reports.

The union had been in discussions with the automaker regarding its July decision to halt production of its Terrain sport utility vehicle in Ingersoll and move the entirety of its production to Mexico. The decision led to 600 layoffs.

Consequently, the union is now seeking commitment from GM to make the CAMI plant the lead manufacturing facility of the Chevrolet Equinox. The plant currently produces the Equinox, but some are still manufactured in Mexico, which makes GM better equipped to handle the strike.

"Every member understands the importance of reaching a deal that secures production, and what that means to our families and the community," said Mike Van Boekel, Local 88 Chair at the CAMI plant.

GM said it was disappointed that it was unable to reach a new agreement.

"We encourage Unifor to resume negotiations and to continue working together to secure a competitive agreement," GM Canada said in a statement.

Shares of GM were inching higher during Monday morning trading. 

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