Those hackers meant business. A U.S. official says a China-based cyberattack on Gmail, Google’s email client, targeted senior White House employees. The hackers were probably hoping that officials were conducting administration business over their private emails, which recent history suggests that they sometimes do—even though that’s prohibited. The Obama administration insists that no official messages were compromised. The White House also said it will not bring up the matter with the Chinese government, which has denied any role in the security breach, until all facts become clearer.