Mumbai, Jan. 24 -- Amid persistent tightness in liquidity conditions, the Reserve Bank of India (RBI) on Friday announced its third tranche of open market operations (OMOs) for the purchase of government securities worth Rs.1 lakh crore and dollar-rupee buy/sell swaps of $10 billion, to be conducted in February. The central bank will purchase government securities worth Rs.50,000 crore each on February 5 and February 12, whereas it will auction dollar/rupee swaps of three years on February 4, it said in a release. "The Reserve Bank will continue to monitor evolving liquidity and market conditions and take measures as appropriate to ensure orderly liquidity conditions," it said. Besides, RBI also announced a 90-day Variable Rate Repo operati...