A massive leak has been spewing natural gas on suburban Los Angeles communities since late October. <br />The leak is taking place at one of the US's largest natural gas repositories, and efforts to stop it have so far proved unsuccessful. <br />The gas is forcing thousands of families to evacuate the area and is turning an affluent suburb into a ghost town. <br />The BBC's Matt Danzico went to Porter Ranch, California to visit a community that may not return to normal for many months.
