Mumbai, April 18 : The BSE Sensex on Monday crashed 1172.19 points to settle at 56,166.74 owing to the weak Asian Market. The Nifty of National Stock Exchange (NSE) too fell 302 pts at 17,173.65. The Sensex registered days high and low at 57,420.80 and 56,842.39 pts respectively. The Nifty recorded days high and low at 17,237.75 and 17,067.85 respectively. NV GK