Chinese firms that sell advertising on Google's search pages have demanded that the internet company disclose its plans for the country, as speculation grows that it will soon close its mainland search service.
The companies have warned that they will demand compensation if Google pulls out of China.
The world's leading search engine said two months ago that it was no longer willing to censor search results and realised that might mean leaving China.
It cited a cyber attack which it believed targeted human rights activists as well as growing internet censorship.
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