India's foreign exchange reserves swelled to USD 254.052 billion for the week ended December 19, up by USD 3.599 billion over the previous week. Foreign exchange reserves stood at USD 250.453 billion in the previous week. The foreign currency assets (FCA), during the week, went up to USD 245.308 billion, up USD 3.583 billion, from USD 241.725 billion in the week-ago period, the Reserve Bank's weekly data showed here.