Special actions launched by national prosecutors are focusing on those working in key sectors

National prosecuting departments will boost efforts to investigate corruption among low-level "flies" - officials at county level or below - in an attempt to strengthen the grassroots, a senior official with the Supreme People's Procuratorate said on Tuesday.

In recent years, the number of low-level officials investigated for corruption, especially those serving in county, township or village authorities, has risen sharply due to their weak legal awareness and loopholes in supervision, said Song Hansong, director under the procuratorate's Duty-related Crime Prevention Department.