Markets activity turned laggard on Tuesday with cash market turnover declining to Rs 65,000 crores ahead of the uncertainty of the U.S. Government shutdown with Sensex sustaining below 50 DMA. The outlook for markets remains cautious after U.S. Indices traded below its major breakdown. For Nifty, crucial support is seen at 19,600 below which, we may see an immediate hit towards 18,800.