The U.S. dollar index was up 0.1% at 101.13 on Monday after earlier touching its highest level since July 8, according to a Reuters report.
Tehran targeted U.S. facilities in states across the Gulf on Sunday, saying it had again closed the vital Strait of Hormuz shipping route, as U.S. and Iranian forces exchanged strikes at the weekend.
The dollar was up 0.2% at 162.075 against Japan’s currency, the yen.
The euro weakened 0.1% to $1.1397 while the British pound slipped 0.2% to $1.3374.
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Australian dollar was down 0.3% at $0.6928 while its kiwi counterpart eased 0.1% to $0.5757.
Oil prices rose in Asian trade, with Brent crude futures up 4.1% at $79.11 a barrel.
