Australian Prime Minister Tony Abbott (L front) and his wife Margaret (R), Australian Governor-General Sir Peter Cosgrove (3rd R) and his wife Lynne Cosgrove leave after attending a national memorial service for the MH17 victims at St. Patrick's Cathedral in Melbourne, Australia, Aug. 7, 2014. Australian Prime Minister Tony Abbott was among 1,800 mourners to attend an official memorial service on Thursday in Melbourne for the 298 people killed on the Malaysia Airlines jet shot down in Ukraine. (Xinhua/Bai Xue)