The Dow Jones Industrial Average, which fell 2.7% last week in its biggest weekly decline since September, weakened 96.11 points or 1% to 9,891.42. The Nasdaq, which has gained almost twice as much as the Dow since September's terror attacks, lost 31.72 points or 1.6% to 1990.74. The Nasdaq has dropped 5% from last week's intra-day high just below 2,100.