BEIJING, March 12 -- The work reports of two Chinese judicial bodies, delivered to the top legislature Thursday, demonstrated that the authorities had stepped up anti-corruption campaign last year.

According to the Supreme People's Procuratorate (SPP), prosecutors probed 3,664 cases of graft, bribery and embezzlement of public funds involving more than 1 million yuan (164,000 U.S. dollars) last year. A total of 4,040 public servants at county level and above, including 589 at city level, were investigated.

A total of 55,101 people were investigated for duty-related crimes in 41,487 cases, an annual increase of 7.4 percent in the number of people, according to the report.

Prosecutors handled serious cases of 28 officials at and above provincial or ministerial levels, including Zhou Yongkang and Xu Caihou in accordance with the law last year, according to the report.

In addition, 7,827 bribers were prosecuted for criminal offenses, up 37.9 percent from the previous year.

The work report of the Supreme People's Court (SPC) showed that Chinese courts in 2014 convicted and punished 44,000 criminals in 31,000 cases of embezzlement and bribery, including severe cases such as Liu Tienan and Li Daqiu.

A total of 2,394 people were convicted for offering bribes last year, up 12.1 percent from the previous year.