Midcap and smallcap indices saw sharp sell-offs amid a broad-based selling in the equity market on May 6 as investors grew cautious ahead of the US Federal Reserve meeting and amid rising India-Pakistan tensions. The Nifty Midcap 100 fell as much as 2.4 per cent, and the Nifty Smallcap 100 tumbled up to 2.6 per cent, severely underperforming the benchmark Nifty 50.