中石油落马4人，反腐之剑指向周永康？(Four oil executives tied to Zhou Yongkang sacked, is Zhou the next target?)
Deutsche Welle, August 28, 2013
http://bit.ly/153gl70
China expands inquiry on graft to oil executives
中国反腐败矛头指向中石油，四高管被查
New York Times, August 28, 2013
http://cn.nytimes.com/china/20130828/c28petrochina/dual/
Related:
China investigates 3 more oil company officials
Associated Press, August 27, 2013
http://www.nytimes.com/aponline/2013/08/27/world/asia/ap-as-china-petrochina-probe.html
