Surging inflows of $ 3.568 billion swelled the reserves past the $250-billion mark at $ 251.330 billion.
The reserves had increased to $ 247.762 billion due to a whopping $11.871-billion inflow during the week ended September 28.
Foreign currency assets increased by $ 3.569-billion to stand at $243.524-billion as against $ 239.955-billion a week before, the Reserve Bank data stated.
Foreign currency assets expressed in US dollar terms included the effect of appreciation or depreciation of other currencies, such as the Euro, Pound Sterling and Yen, held in its reserves.
During the week, gold reserves and Special Drawing Rights remained static at $7.367-billion and at $2 million respectively.
The reserve position in the IMF came down by $1 million to stand at $ 437 million.