General Motors (GM - Get Report)  has appealed directly to its employees, bypassing the United Auto Workers union, in an effort to end a strike that is entering its fourth week.

GM now says it is committed to investing $7.7 billion in its U.S. factories, a figure that's up from its previous offer of $7 billion.

The company also says that the investment will now be direct instead of a mix of direct and indirect investments.

"The strike has been hard on you, your families, our communities, the company, our suppliers and dealers," GM said in a letter.

"The company's strategy from day one has been to play games at the expense of the workers," the UAW said in a Friday statement responding to GM's latest proposal.

"It has released half-truths, ripped away health care in the middle of the night, and it reverted to previously weak and unacceptable proposals in response to the UAW's comprehensive solutions."

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