Car companies seem to be the ones most affected, but camera and electronics manufacturers are being attacked as well.
If you've somehow missed it, there is a huge dispute happening now between Japan and China. It's the kind that goes way back and doesn't seem to have a resolution that will make both countries happy. It's, well, complicated.
Protests in China have become incredibly intense, resulting in violence, looting, and arson. Japanese car dealerships have been burned down, Japanese products destroyed and even workers are causing problems. Panasonic's plant was even sabotaged.
As a safety measure to their products and – more importantly – their workers, many Japanese companies have shut down their plants for a day or two in hopes that things will ease up. Expect to see them remain closed longer if tensions stay as high as they are.