This is the best summary I could come up with:

TOKYO, Aug 29 (Reuters) - Toyota Motor Corp (7203.T) suspended operations at a dozen assembly plants in Japan on Tuesday due to a malfunction with its production system, the automaker said, likely bringing to a halt almost all of its domestic output.

All together, its 14 plants in Japan account for around a third of Toyota's global production, according to Reuters calculations.

Operations were suspended from Tuesday morning and it was unclear whether they could be resumed from the afternoon shift, the spokesperson said.

Toyota's operations ground to a halt last year when one of its suppliers was hit by a cyberattack.

The automaker is a pioneer of the just-in-time inventory management, which keeps down costs but also means that a snarl in the logistics chain can put production at risk.

Some Japanese businesses and government offices have reported a flood of harassing phone calls in recent days, which the government has said were likely from China, following the release of treated radioactive water from the Fukushima nuclear power plant into the Pacific.

The original article contains 295 words, the summary contains 173 words. Saved 41%. I'm a bot and I'm open source!