Stock Market Today, Oct. 23 -- Indian stock markets witnessed a dramatic reversal on Friday, October 23, as the Sensex and Nifty erased their early gains and plunged into negative territory, extending their losing streak to a fourth session.

Surging crude oil prices amid escalating Middle East tensions, a global sell-off and broad-based selling in mid-cap and small-cap stocks weighed on investor sentiment, turning a promising start into a bruising session for Dalal Street.

The BSE Sensex jumped 517 points, or 0.7%, to an intraday high of 73,766.51 in early trade before reversing sharply to hit a low of 72,487.47, a fall of 1,279 points from the day's peak. The NSE Nifty 50 followed a similar trajectory, rising 99 points, or 0.4%, to 22,...