The nation's top auditor has vowed to improve management of insurance funds following a string of abuses including the theft of nearly 400 million yuan in social security funds in northwestern Ningxia region . An investigation led by National Audit Administration carried out from September to November last year uncovered the irregularities in Ningxia, Xinhua said. The audit covered the collection, management and use of seven kinds of social security funds, including pensions and medical insurance. The probe revealed that officials of the health insurance fund management centre in the city of Shizuishan transferred more than 3.2 million yuan of premiums to the bank accounts of friends and relatives. A further 2.5 million yuan of medical insurance funds was transferred to a local pharmaceutical company through eight illegal bank transactions using false documents. The Ningxia government has vowed to tackle the problem of theft by establishing a committee to supervise social security funds and improve the transparency of their management. The mainland has ordered annual audits of social security funds following revelations of widespread abuses by local governments in Ningxia, Shanghai and other places, China News Service said. The National Audit Administration said in a recent directive that government bodies must conduct yearly audits of five types of social security funds, starting within three years. The funds to be scrutinised include retirement, medical, unemployment, workers' compensation and childbirth insurance. The audits will examine several areas, including revenue and expenditure and how funds are collected, managed and used. Audit bodies should ensure government policies are implemented and the safety of the funds is guaranteed. The government fears misuse of social security funds could cause social unrest and protests over official corruption.