A massive explosion in Kobani.<br/> <br />Smoke fills the skies amid the battle for control of the Syrian border town that is taking center stage in the fight against Islamic State.<br/> <br />Weeks of air strikes and the deaths of hundreds of militant fighters have failed to break the siege.<br/> <br />Now Iraqi peshmerga fighters are preparing to head into the battle.<br/> <br />The siege of Kobani has become a test of the U.S.-led coalition's ability to stop Islamic State's advance. And, Washington is welcoming the deployment, intensifying its air strikes ahead of their arrival.
