The number of people trying to use the metro has almost doubled Chilean President Michelle Bachelet has sacked four ministers, as polls suggest falling support for her government. The last few months have seen protests in the capital, Santiago, over the introduction of a new transport system. In a national TV address, Ms Bachelet said her government owed an apology to Santiago's residents, especially the poor, for the chaos they have faced. It is the second big cabinet reshuffle since she took office in 2006. The first one followed student protests. Increased strain Speaking on Monday evening, Ms Bachelet...