How living near major roads could put you at higher risk of developing dementia. And six letters from Princess Diana to a Buckingham Palace steward are sold at auction for more than £15,000. And coming up in sportsday on bbc news, sir andy murrays through to the qatar 0pen semi finals after beating spains nicolas almagro. Hell face eitherjo Wilfried Tsonga or Tomas Berdych in the last four. Good evening. American intelligence officials have given a stark warning about the threat posed by russian cyber attacks. The Outgoing Us National Intelligence director, james clapper, told a Senate Hearing he hasnt come across a more Aggressive Campaign to interfere with an American Election than russias actions in last years race for the white house. Mr clapper who will brief donald trump about his findings tomorrow said the hacking of Democratic Party emails had been ordered by the kremlin. Washington is investigating what could be the biggest political break in since watergate. In the 70s it wa