A rough start to the trading session is on the cards as overnight weakness in the US markets has triggered a slump in other Asian counterparts after the US Federal Reserve hinted at a one more rate hike by the end of this year even as it kept rates unchanged in its FOMC meeting yesterday. Another negative catalyst has been frenzied selling by foreign institutional investors as they sold shares worth Rs 3110.69 crores in the domestic equity markets on Wednesday, which could further dampen the sentiment. The firm US Dollar index and treasury yields are also driving FIIs to desert emerging market equities.