Stock losses accelerate into the close as momentum stalls: Nasdaq drops 3%, Dow sheds nearly 500 points

US stocks were under pressure Tuesday, with the Nasdaq losing about 3% as selling ramped for technology shares especially. As of the close, the S&P 500 was off 2%, bringing it down to 3,821.74. The Dow fell by 490 points, or 1.6%, and the Nasdaq dropped 2.98% to 11,181.54. The small cap Russell 2000 was…