The government of the southwestern Chinese city of Chongqing renewed its attacks on two of its disgraced former leaders on Monday, saying one had set up an "independent kingdom" while the other was a lazy deceiver.

Chongqing, one of China's most important cities, is perhaps best known outside China for its association with its one-time party boss, Bo Xilai, once himself a contender for top leadership before being jailed for life in 2013 in a dramatic corruption scandal.

In July, another of its party chiefs, Sun Zhengcai, was sacked after he was accused of corruption. Sun, who has yet to face a court, had also been seen as a contender for promotion to the highest echelons of power in China.