In August the central bank had sold 197.6 million US dollars in foreign exchange markets to commercial banks to maintain a peg with the US dollar at around 110 rupees.
No purchases had been made.
August interventions were lower than July's 416 million US dollars. But analysts say in September sales had picked up again.
Central Bank officials have said the interventions are temporary though analysts have warned that conflicting exchange rate and interest rate policy was pressuring the peg.
End-August reserves were equal to 5.4 months of imports, only slightly lower than the 5.8 month level in July.
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