At noon, the SET Index stood at 1,500.97 points, losing 20.51 points or 1.35 per cent. Turnover was brisk at Bt50.5 billion. At one point, it plunged by 45 points, to 1,477.28 points. MSCI’s broadest index of Asia-Pacific shares outside Japan extended early gains and was up 1.4 per cent by midday.