Infosys, Wipro shares crash to 6-year lows as IT sell-off gathers pace; what is weighing on the sector?

New Delhi, Sept. 29 -- Shares of Infosys and Wipro, the country's second largest and fourth-largest IT services companies, have remained under sustained selling pressure, with the decline deepening further in Tuesday's trade.During the intraday session, Infosys shares breached the Rs.1,000 mark aga…