The rupee fell 4 paise to 91.89 against US dollar in early trade on Wednesday after opening at 91.92 in the interbank foreign exchange. The depreciation was triggered by net FII outflows of ₹4,672.64 crore on Tuesday amid tensions in Middle East, PTI reported. Domestic equity benchmarks, Sensex and Nifty also declined by over 1% each in the morning session.