A war of words broke out yesterday between Hong Kong's top prosecutor and a pro-government politician over the James To Kun-sun affair. In a strongly worded letter to district councillor Chan Wan-sang of the Democratic Alliance for the Betterment and Progress of Hong Kong, Director of Public Prosecution Grenville Cross said claims that he has turned a blind eye to Mr To's alleged misdeeds were 'scurrilous'. The row started on Wednesday when Mr Chan sent an open letter to Mr Cross, asking if his links to the Democratic Party affected his decision not to prosecute Mr To. Mr To was accused of paying above-market rent for the office in Shamshuipo owned by a company called Target Link. He then claimed the money back in expenses but failed to declare his stake in the company, which he said he held in trust for the Democratic Party. In a letter of response yesterday, Mr Cross denied he had any special link with the Democratic Party and said the decision not to prosecute was due to lack of evidence. 'Your suggestion that the decision not to prosecute Mr To might somehow have been influenced by improper consideration is scurrilous,' the letter said. 'It would not be right for me to bend the rules in respect of Mr To and to lower the threshold for prosecution, simply because some people feel he should be prosecuted. 'May I suggest that before you put pen to paper in the future, you check the facts carefully and ensure that your assertions are firmly based in reality.' Mr Chan, who urged Chief Executive Donald Tsang Yam-kuen to intervene in a letter yesterday, said the police and the Independent Commission Against Corruption did 'a bad job' collecting evidence. 'Why is Mr Cross so angry and losing the manners an English gentleman should have?'