The rupee opened weak by 4 paise at 66.96 against the dollar at the forex market as the American unit strengthened overseas.

Forex dealers said increased demand for the US currency from importers and the greenback’s gains against other currencies overseas put pressure on the rupee.

On Monday, the rupee had gained 9 paise to close at 66.92 per dollar in view of strong foreign capital inflows coupled with a firm equity market.

Forex market had remained closed yesterday on account of Municipal Elections for Greater Mumbai.

Meanwhile, the benchmark BSE Sensex rose 96.71 points or 0.33 per cent to 28,858.30 in early trade.