Did China really hack into Pentagon mainframe?

According to Financial times's report,China's military successfully hacked into the Pentagon's computer network,but Chinese official denied that thing. The cyber attack was carried out in june following months of efforts ,the newspaper said.US official said"There was a very high level confidence that China's military hacked into Pentagon". They pinpointed the oigin of attack. It seems like a story of cold war era.China's GDP is increasing rapidly .Recently they succeeded test of anti satellite missile.They became third country which have anti satellite missile.next to US and Russia.Exactly China is becoming advanced country.But in other side China export low price but bad quality products.For example toy and food made in china in US. The local of China is under the bad enviroment.Pollution of river ,atmosphere,there are many problem to join in the advanced countries. Next year, olympic will held in Beijing.Chinese government make effort to reform structure of city to be accept to foreginers.I expect to this effort will bring good reputaion to China. But I don't know Chinese government is doing secretly. China is still communistic country.If China's military really hacked into Pentagon ,it was very severe incident.Because after the hacking ,Pentagon was forced to be under the shutdown of computer system and took two week and more to recovery the system.US officials said the penetration in June raised concerns to a new leve because of fears that China had shown it could disrupt systems at critical times. US forces are still hunting for Bin laden after 6 years from attack in september 2001.Iraq and Afghan are still under the terrorism.Where is the US heading to ?How to do to make real globalization and peaceful world ?We must think this incident more serious.