BEIJING - China's Supreme People's Procuratorate (SPP) has urged all procuratorial agencies to increase supervision over criminal investigations conducted by local police stations.

The move will improve cooperation between public security organs and procuratorates so as to deepen the country's judicial reform, said the SPP.

Since 2015, the SPP has carried out a pilot program in 10 provincial level regions involving 1,064 local procuratorates and 8,370 police stations, it said.

Procuratorial agencies have supervised 5,243 cases filed by police stations in the program since 2015, and made suggestions on dealing with criminal investigations that violated the law, it said.

Such supervision should spread across the country by the end of 2017, it added.

Deputy Procurator-General Sun Qian said that the supervision will ensure the validity of evidence and improve effectiveness of investigations.