``Today domestic markets are likely to witness a gap down opening as majority of Asian markets are trading with losses of over two per cent on worries of Dubai Debt, `` said leading brokerage house Hem Securities while commenting on the trends of equity markets for today.

``Domestic markets are likely to trade negative today,`` it added.

On the technical front it noted that today, ``Nifty would have a support at 4,921 and resistance at 5,015 and BSE Sensex has support at 16,612 and resistance at 16,912.``

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