China expands surveillance system with 20 million cameras

China has installed more than 20 million cameras across the country as part of a new surveillance system.

Dubbed the world's "most advanced video surveillance system", the cameras are reportedly part of China's Sky Net operation, an effort to track down fugitives and criminals.

The cameras will use artificial intelligence to identify pedestrians and motorists.

A mock-up of how the network works was shared on Chinese social network Weibo.

It demonstrates how information tabs come up next to people providing data such as gender and what they like wearing.

The information will be shared with police if it matches descriptions of criminals.

Some reports suggest the technology can also work out what cars are on the roads.