Shenyang mayor Mu Suixin has formally resigned following reports he was linked to corruption and triad activities. Xinhua said the Standing Committee of the Shenyang People's Congress had accepted Mr Mu's resignation and Liaoning vice-governor Chen Zhenggao would replace him. While the report said only that Mr Mu had resigned because of health problems, mainland newspapers said he had been under pressure since his deputy Ma Xiangdong was arrested after he was found gambling away 40 million yuan (HK$37.6 million) of public funds in Macau's casinos. Mainland media said Ma was arrested in July last year. The head of the city's procuratorate, the vice-president of the intermediate court, and Mr Mu's ex-wife were also implicated. They had allegedly tipped off Ma's wife after Ma was detained by the party watchdog. According to mainland media, Mr Mu also had links with gambling activities organised by 'domestic and overseas triads'. A Shenyang provincial official confirmed the kidnapper and hostage who died in a hostage tragedy on Thursday were sons of two former senior Shenyang officials. Kidnapper Wang Qunchao committed suicide after a 24-hour stand-off with police. He had earlier shot dead hostage Wang Jiang.