Government Officials Say they were released in a swap for detained leaders of the islamic extremist. Nearly 200 girls remain captive but it is unclear how many may have wide. The u. S. Air force is accelerating efforts to increase its firewalls after escalating Cyber Security threats. They are said to be tightening algorithms for networks that control everything from navigation of work lanes to weapons systems. Global news 24 hours a day powered by more than 2600 journalists and analysts in over 120 countries. Im mark crumpton. This is bloomberg. Scarlet we are 30 minutes from the close of trading in new york. Im scarlet fu. Joe im joe weisenthal. Matt and im matt miller. Joe u. S. Declines hearing by more than half after the s p was brought back from a three month low, but the question is whatd you miss . Data isek chinese trade fostering new doubts about the health of the World Economy is the Federal Reserve is preparing to tighten. Chairmanwells fargo and ceo is out, marking a stunn