us president barack obama has ordered a "deep dive" into a series of cyber-attacks, blamed on russia, that shook the us election season. obama has asked the intelligence community to deliver its final report before he leaves office on january 20. the announcement comes after top us intelligence officials blamed the kremlin for directing a series of hacks amid the 2016 presidential election and as democrat and republican lawmakers have stepped up calls for a federal probe into the degree to which russian hackers sought to interfere in the election. the hacks targeted emails at the democratic party and a key aide to presidential nominee hillary clinton which the democrats claimed as a deliberate attempt to undermine mrs clinton's campaign. according to a secret cia assessment, russia intervened to help donald trump win. mr trump, who will succeed mr obama in the white house next month, has consistently disputed such allegations. this week he told time magazine: "i don't believe it. i don't believe they [russians] interfered." he added that he thought the accusation against russia was politically driven. russian officials have denied the hacking accusations.