Federal authorities last week launched a probe of a suspected cyberattack that targeted the private Gmail account of a White House staffer. The employee's correspondence turned up on the DCleaks hacktivist site, which earlier this month posted the private emails of former Secretary of State Colin Powell. The latest dump involves the private account of White House staffer Ian Mellul, whose emails were published with the claim that they represented just part of a trove of correspondence from February 2015 through June of this year.