China earlier this week banned government officials from using iPhones and other foreign smartphones for work or from bringing such devices to their government offices, and now China is expanding the ban. According to Bloomberg, multiple state agencies and state companies have started telling workers not to bring their iPhones in to their jobs.

[Bloomberg says Apple shares are down some $200 billion in value.]

The restriction is expected to expand to additional government-controlled organizations in the future as China aims to block foreign technology. China does not yet have a formal injunction, so it is not yet known how many companies may adopt the iPhone restrictions. China has a huge number of state-owned enterprises in power generation, seaport construction, mining, manufacturing, education, and investment markets. Foreign devices have historically been discouraged in sensitive agencies, but China is now taking a firmer stance.

Read more at MacRumors.