Beijing police have ordered supermarkets and shopping malls to install high-definition security cameras, as China continues its huge expansion in monitoring technology.
The country has added millions of surveillance cameras over the last five years, part of a broader increase in domestic security spending.
In May, Shanghai announced that a team of 4,000 monitor its surveillance feeds to ensure round-the-clock coverage. The south-western municipality of Chongqing has announced plans to add 200,000 cameras by 2014 because "310,000 digital eyes are not enough".