The United Auto Workers union launched simultaneous strikes at three factories owned by General Motors, Ford and Chrysler parent Stellantis early on Friday, kicking off the most ambitious U.S. industrial labor action in decades.

The walkouts at the "Detroit Three" will halt production of the Ford Bronco, Jeep Wrangler and Chevrolet Colorado pickup truck, along with other popular models. UAW President Shawn Fain said the union will hold off for now on more costly companywide strikes, but said all options are open if new contracts are not agreed.

Fain laid out plans for the unprecedented, simultaneous walkouts in a Facebook Live address less than two hours before the expiration of the old contract.