The United Auto Workers union says it will announce on Friday how it plans to expand its strike against Detroit's three automakers.

The union says President Shawn Fain will make the announcement at 10 a.m. Eastern time in a video appearance addressing union members. Additional walkouts will take place at noon Friday without serious progress in contract talks, the union said.

The union went on strike Sept. 14 when it couldn't reach agreements on new contracts with Ford, General Motors and Jeep maker Stellantis.

At first it targeted one assembly plant from each company, and last week it added 38 parts distribution centers run by GM and Stellantis. Ford was spared the second escalation because talks with the union were progressing.

The union wouldn't say what action it would take on Friday, reiterating that all options are on the table.

The union is scheduled to meet with GM negotiators Wednesday afternoon, according to two people with direct knowledge of the talks who spoke on condition of anonymity because they were not authorized to speak on the record.

Fain said on Tuesday that negotiations were moving slowly and the union would add facilities to the strike to turn up the pressure on the automakers.

In past years the union has picked one company as a potential strike target and reached a contract agreement with that company that would serve as a pattern for the others.

But this year Fain introduced a new strike method of targeting only part of the companies' plants, with plans to add more in an effort to get the automakers to raise their offers.

Currently only about 12% of the union's 146,000 workers at the three automakers are on strike, allowing it to preserve a strike fund that was worth $825 million before Sept. 14.

If all of the union's auto workers went on strike, the strike fund would be depleted in less than three months, and that's without factoring in health care costs.