UAW threatens to expand strike to more auto plants by end of week

The auto workers' strike against Detroit's Big Three entered its fourth day with no signs of an early breakthrough and amid a threat by the United Auto Workers that the labor action could soon escalate. 

A spokesman for General Motors said that representatives of the company and the labor group were continuing to negotiate. But In a video statement late Monday, UAW President Shawn Fain said more factories could be targeted if "serious progress" toward an agreement isn't reached by Friday at noon.

"Autoworkers have waited long enough to make things right at the Big Three. We're not waiting around, and we're not messing around," he said.