Guangdong courts convicted more than 100 officials in the first four months of the year during a province-wide clampdown on commercial bribery. Provincial party paper the Nanfang Daily yesterday quoted authorities as saying the province investigated 605 commercial bribery cases from January to April, 71 of which were serious incidents involving government officials. 'A total of 147 officials were punished according to party or government rules, and 116 of them also received sentences,' the report said, mentioning that four of those who had been punished were in senior positions. A nationwide crackdown on commercial bribery was launched after senior leaders, including Premier Wen Jiabao, ordered investigators to produce examples of the authorities' determination to get tough on corruption in the commercial sector. Zhong Yangsheng, a vice-governor of Guangdong and head of the provincial anti-commercial bribery team, said the key sectors in the battle against the problem were in construction, land leases and sales, medical purchases, government procurement, and investment promotion. He also said judicial authorities should mainly target 'officials who seek illegal profits by interfering with commercial activities, and those who bribe officials to obtain business opportunities'. In neighbouring Hunan province , authorities said they had punished 155 government officials above the county level while cracking down on commercial bribery in the past three years. Provincial prosecution authorities said on Monday that they had investigated 1,184 commercial bribery cases in the past three years, more than 50 per cent of which they considered to be serious incidents.