MUMBAI: Erasing early gains, BSE benchmark Sensex on Thursday lost 132 points to close at a fresh one week low as investors booked profits in bluechips led by TCS and Infosys after these IT majors posted smart quarterly numbers.

After opening higher and rising to as much as 20,621.3, the 30-stock index failed to maintain the upward momentum and closed lower by 132.11 points or 0.64% at 20,415.51. This is Sensex’s biggest single-day fall in this month.

Similarly, the broader-based National Stock Exchange index Nifty fell by 43.20 points, or 0.71%, to 6,045.85. The SX40 index on the MCX Stock Exchange closed lower by 49.26 points at 12,179.29.