pTRIPOLI, Libya ? More than a month after attacks in Libya left the U.S. ambassador and three other Americans dead, the United States is struggling to bring the killers to justice. But when American officials try to speak to Libyan leaders, there?s often no one on the other end of the line./pa href="http://www.washingtonpost.com/world/middle_east/political-chaos-in-libya-hampers-us-probe-of-benghazi-attacks/2012/10/12/980e8516-13df-11e2-ba83-a7a396e6b2a7_story.html?wprss=rss_world"Read full article #62;#62;/aimg width='1' height='1' src='http://feeds.washingtonpost.com/c/34656/f/636708/s/246aae86/mf.gif' border='0'/br/br/a href="http://da.feedsportal.com/r/144544826700/u/0/f/636708/c/34656/s/246aae86/a2.htm"img src="http://da.feedsportal.com/r/144544826700/u/0/f/636708/c/34656/s/246aae86/a2.img" border="0"//aimg width="1" height="1" src="http://pi.feedsportal.com/r/144544826700/u/0/f/636708/c/34656/s/246aae86/a2t.img" border="0"/