The United Auto Workers expanded its strike against major automakers Friday, walking out of 38 General Motors and Stellantis parts distribution centers in 20 states.

Another 5,600 additional workers joined the strike on top of the 13,000 of the 146,000 members that began the strike one week ago.

Ford was spared additional strikes because the company has met some of the union’s demands during negotiations over the past week, said UAW President Shawn Fain.

“We’ve made some real progress at Ford,” Fain said during an online presentation to union members. “We still have serious issues to work through, but we do want to recognize that Ford is showing that they are serious about reaching a deal.”

“At GM and Stellantis, it’s a different story,” he said. Those companies, he said, have rejected the union’s proposals for cost-of-living increases, profit sharing and job security.