The number of corruption cases heard by Chinese courts jumped by about one-third last year, as the country's top prosecutor vowed on Sunday there would be no let up in China's campaign against deep-seated graft.

Since assuming office more than four years ago, President Xi Jinping has waged war on corruption, warning, like others before him, that the problem is so bad it could affect the ruling Communist Party's grip on power.

Dozens of senior figures have been jailed for corruption and abusing their positions, including a once powerful domestic security chief, Zhou Yongkang.