China leadership contender under investigation: sources

By Philip Wen and Benjamin Kang LimBEIJING (Reuters) - A senior Chinese official who was considered a contender for top leadership has been put under investigation, three sources with ties to the leadership said, ahead of a Communist Party congress in the autumn where Xi Jinping will cement his grip on power.Sun Zhengcai had been party chief of the southwestern megalopolis of Chongqing, until an abrupt announcement on Saturday morning that he no longer had the position and had been replaced by a