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Most emerging Asian currencies also eased on expectations of higher dollar demand for oil imports given worries that the intensifying Iraq crisis will disrupt crude supplies from the world's second-largest OPEC producer.
The rupiah fell as much as 0.8 percent to 12,085 per dollar, its weakest since Feb. 13, on dollar demand linked to dividend payments to foreign investors and as local importers joined the bids.
Malaysia's ringgit also fell as investors scrambled for the dollar to cover short positions in the greenback.
The South Korean won slid on dollar demand from local importers for payments.
The peso eased as the country reported a wider trade deficit in April than a year earlier.