DETROIT (AP) - The Latest on the strike by General Motors workers (all times local):

10:25 a.m.

Contract talks aimed at ending a 21-day strike by the United Auto Workers against General Motors are taking a turn for the worse, hitting a big snag over product commitments for U.S. factories.

A new letter from UAW Vice President Terry Dittes to workers casts doubt on whether there will be a quick settlement in the contract dispute, which sent 49,000 workers to the picket lines on Sept. 16, crippling GM's factories.

Dittes' letter says the union presented a proposal to the company Saturday. He said GM responded Sunday morning by reverting back to an offer that had been rejected and made few changes.

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