Exclusive: FBI probes hacking of Democratic congressional group - sources

By Joseph Menn, Dustin Volz and Mark Hosenball SAN FRANCISCO/WASHINGTON (Reuters) - The FBI is investigating a cyber attack against another U.S. Democratic Party group, which may be related to an earlier hack against the Democratic National Committee, four people familiar with the matter told Reuters. The previously unreported incident at the Democratic Congressional Campaign Committee, or DCCC, and its potential ties to Russian hackers are likely to heighten accusations, so far unproven, that M