washington/san francisco computer network use democratic presidential nominee hillary clinton campaign hack part broad cyber attack democratic political organizations people familiar matter tell reuters late attack disclose reuters friday follow two hack democratic national committee dnc party fundraise committee candidates u.s. house representatives clinton campaign spokesman say statement late friday analytics data program maintain dnc use campaign number entities access part dnc hack campaign computer system review outside cyber security experts date find evidence internal systems compromise say clinton campaign spokesman nick merrill late campaign official say hackers access analytics program server approximately five days analytics data program one many systems campaign access conduct voter analysis include social security number credit card number official say u.s. department justice national security division investigate whether cyber attack democratic political organizations threaten u.s. security source familiar matter say friday involvement justice department national security division sign obama administration conclude hack sponsor state people knowledge investigation say unclear exactly material hackers may gain access third attack sensitive democratic target disclose last six weeks cause alarm party beyond three months nov. u.s. presidential election hackers u.s. intelligence officials conclude russian gain access entire network fundraise democratic congressional campaign committee dccc say people familiar matter detail extent breach reuters first time cyber security experts u.s. officials say early week conclude base analysis malware aspects dnc hack russia engineer release hack democratic party email influence u.s. presidential election u.s. federal bureau investigation say friday aware media report cyber intrusions involve multiple political entities work determine accuracy nature scope matter fbi take seriously allegations intrusions continue hold accountable pose threat cyberspace agency say email statement hack involve private email system clinton use secretary state yahoo news report thursday night fbi warn clinton campaign last march target cyber attack involve spearphishing ask campaign turn sensitive data help investigation campaign lawyers reject request intrusive source familiar matter confirm account reuters new disclosure reuters hackers gain access full dccc network mean would access everything network email strategy memos opposition research prepare support democratic candidates campaign house hack dccc base washington report first reuters thursday ahead clinton speech philadelphia accept democratic party nomination russian officials could immediately reach comment several u.s. officials say obama administration avoid publicly attribute attack russia might undermine secretary state john kerry effort win russian cooperation war islamic state syria officials say administration fear russian president vladimir putin might respond public move escalate cyber attack u.s. target increase military harassment u.s. ally aircraft warships baltic black seas make aggressive move eastern europe officials question approach argue respond forcefully russia would effective remain silent obama administration announce april 2015 executive order could apply economic sanction response cyber attack hack dnc make public june lead wikileaks publish 19,000 email last weekend show favoritism within dnc clinton u.s. senator bernie sanders vermont dnc chairwoman debbie wasserman schultz resign sunday result create rocky start party convention philadelphia week republican presidential nominee donald trump wednesday invite russia dig thousands miss email clinton time state department prompt democrats accuse urge foreigners spy americans thursday trump say remark mean sarcasm early week clinton campaign senior policy adviser jake sullivan criticize trump call hack national security issue trump campaign spokesman jason miller say friday report breach show cyber security problem wherever hillary clinton go hopefully time classify top secret information put american live risk washington dccc say early friday hire cyber security firm crowdstrike investigate take continue take step enhance security network dccc say cooperate federal law enforcement respect ongoing investigation dccc additional comment late friday officials dnc respond request comment senator dianne feinstein california democrat top democrat senate intelligence committee tell cnn friday hear hack clinton campaign say surprise think pretty clear campaign aware problem everybody cautious exclusive clinton campaign also hack attack democrats