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© AGP/GETTY IMAGESA group of defendants face sentencing for a variety of charges linked to organised crime in 2009
The Chinese mega-city of Chongqing plans to build a $2.6 billion (£1.6 billion) security system that will be one of the world's largest with 500,000 surveillance cameras, China's state media said on Tuesday.

Wang Zhijun, the city's police chief, said the system would be the world's largest new security network since the September 11, 2001 attacks in the United States, the Global Times reported.

The system would dwarf a network of 40,000 security cameras installed in the capital of China's far-western Xinjiang region last year, following deadly July 2009 clashes between Muslim Uighurs and members of the majority Han group.

Chongqing's more than 500,000 cameras, which are due to be installed by 2012, will mainly be used for crime prevention, emergency controls and rescue operations, a police spokesman told the Global Times.

The computerised cameras will be managed under one network, allowing authorities and emergency services in the province-sized area of more than 30 million people to share the video feeds, the paper said.

A crackdown on organised crime two years ago in the sprawling municipality led to numerous high-level prosecutions for corruption and mafia crime that have shocked the nation as it revealed Chongqing's underworld.