The rupee plunged by 15 paise at 67.98 against US dollar at early trade on Wednesday at the Interbank Foreign Exchange market as the dollar firmed up overseas.
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The domestic currency opened at 67.91 a dollar and touched a low of 67.98.
The forex market had remained closed yesterday for the Republic Day.
Meanwhile, Sensex too was down 4 points at 24,481 in early trade.