Domestic equity markets witnessed heavy selling in the last hour of trade on Friday which resulted in the National Stock Exchange’s (NSE) 50-share Nifty shutting shop below the psychological mark of 5000. After spending most part of the day in a tight range markets came under pressure in late afternoon trades on concerns over likely monetary tightening measures by the Reserve Bank of India (RBI). Weak Asian markets also weighed on sentiments in trade. Investors opted to take some profit off the table ahead of the holiday season, which starts next week. Sell-off was led by realty, oil & gas and banking sector stocks while selective buying was witnessed in healthcare, consumer durables and auto shares.