Tesla has suspended production at its plant on the outskirts of Shanghai, people familiar with the matter told Bloomberg.

The company informed many factory workers, who were supposed to return to work Wednesday after China’s five-day Labor Daybreak, to extend their holiday and return as soon as May 9, according to the people, who asked not to be identified as the information is not public.

The reason for the abrupt halt was not immediately clear but Chinese technology news site 36kr reported that it was because of component shortages.

While Tesla’s only car factory outside the U.S. is seeing delays in receiving parts for its Model 3 in the future, it’s also facing problems with a crucial piece of manufacturing equipment that is being fixed, according to the people.

The production halt means that Tesla is not making any cars worldwide because its other vehicle-assembly plant — in Fremont, California — has been idled because of the Coronavirus. That has made the Shanghai factory even more crucial for Tesla as the U.S. is weeks, if not months, behind China in reopening its economy.

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Some employees are on-site in the China plant for equipment inspection, maintenance and repair, the people said. The plant was temporarily idled earlier this year because of the coronavirus outbreak, but it was also among the first automakers to resume production, helped by aid from local authorities. That helped Tesla see a sales jump in March in China, while others struggled.

Tesla said in a statement that its Shanghai factory is conducting normal maintenance work and that the company made use of the Labor Day holidays to conduct production-line adjustments. The holidays were from May 1 to May 5.

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