Using a unique dataset on daily foreign exchange intervention and a new methodological framework of a latent factor model of central bank intervention, this paper addresses the effects of intervention in an emerging market. Events in financial markets from 2002 to 2010 provide a natural experiment to evaluate the short and medium term objectives of the central bank to contain excessive exchange rate volatility and to accumulate foreign reserves respectively. In the low volatility period in the first part of the sample, the central bank is successful in influencing the currency when pressure is to appreciate, accumulating international reserves. The same model estimated for the global volatility period in the second part of the sample shows the central bank intervening to mitigate excessive exchange rate volatility in line with the short-term objective.