General Motors will announce that it's spending more than $1 billion to expand an SUV factory in Arlington, Texas.

The company wouldn't comment on specifics of the investment. But it has scheduled a news conference for 1 p.m. Central Time to be attended by the company's labor relations chief and the United Auto Workers vice president who handles GM.

Demand for GM's big SUVs has been so strong that the plant can't make them fast enough. The Arlington factory has about 3,800 hourly workers on three shifts making SUVs such as the Chevrolet Tahoe and Suburban, the GMC Yukon and the Cadillac Escalade.

Sales of the SUVs are up more than 10 percent through June, according to Autodata Corp.

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