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By 0154 GMT, Philippines main stock index plunged 4.6 percent to 4,130.63 to a near two-month low, and Malaysia's index dropped 3 percent to 1,451.87, the lowest since September 24, last year.
At 0215 GMT, Malaysia was down 3 percent after falling as much as 4.9 percent earlier. Vietnam stocks were down 2.4 percent.
Copyright Reuters, 2011