As China's anti-corruption efforts gained attention and momentum last year, a strong message was sent out at this year's plenary session curbing corruption at its source and widening the scope of investigations.

"At present, the clean governance construction and anti-corruption drive remains an arduous task," said Hu Jintao, president of China and general secretary of the CPC Central Committee, in a speech at Tuesday's session of the CPC Central Commission for Discipline Inspection (CCDI).

Hu said the Party should incorporate anti-corruption work in the economic, political, cultural and social spheres as well in the development of the Party itself.