On January 31, 2013, the "New York Times" reported that it had been the target of attacks by the Chinese hackers. The first breach took place on the September 13, 2012 when the newspaper was preparing to publish an article about the fortune amassed by the family of outgoing Prime Minister Wen Jiabao. The newspaper said the purpose of attacks was to identify the sources that supplied the newspaper with information about corruption among the prime minister's entourage. The "Wall Street Journal" and "CNN" also said they had been the targets of cyber attacks from China. In February, Twitter disclosed that the accounts of some 250,000 subscribers had been the victims of attacks from China similar to those carried out on the "New York Times". Mandiant, the company engaged by the NYT to secure its network, identified the source of the attacks as a group of hackers it called Advanced Persistent Threat 1, a unit of the People's Liberation Army operating from a 12-story building in the suburbs of Shanghai that had hundreds, possibly thousands, of staff and the direct support of the Chinese government.