The Rupee was trading 10 paise down at 66.91 against the US Dollar in late morning trade on Friday.

Higher demand for the American currency from banks and importers and flat opening of domestic equity markets pushed the domestic currency in the negative zone.

The Rupee had closed five paise down at 66.81 against the US Dollar on Thursday.

Meanwhile, the index Sensex was trading 30 points down at 28.094 at 11.15 am.