Toyota, the world’s biggest carmaker, has halted operations at all of its assembly plants in Japan following a system malfunction.

The Japanese car manufacturer suspended operations at its 14 domestic plants after the glitch left the company unable to order components, a company spokesperson said on Aug. 29th.

The company had earlier in the day suspended operations at 12 plants, leaving the Miyata facility in Fukuoka and subsidiary Daihatsu’s facility in Kyoto operating as normal.

The carmaker said it did not know when operations would resume.

The system error is not believed to be the result of a cyberattack, the spokesperson said.

Toyota was forced to temporarily suspend operations at all 14 domestic plants in February last year after supplier Kojima Industries was hit by a cyberattack.

Toyota shares fell by 0.64 percent in morning trading following the news.