The Bombay Stock Exchange Sensex closed down by 207 points today at 18,137. The 30-share index hit a high of 18435 and low of 18084 in trade today. The National Stock Exchange Nifty also ended down by 60 points at 5,438. The Benchmarks ended with heavy losses as poor quarterly results from State Bank of India, higher subsidy sharing reports on ONGC and reports suggesting drilling of new wells will be delayed by Reliance Industries in KG-DG basin.