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The Strait of Hormuz, connecting the Persian Gulf to the Gulf of Oman, for example, is known to have relatively bad visibility year-round.
The strikes targeted an Iranian-backed militia in retaliation for recent missile and drone attacks on American troops in Iraq and Syria.
An Iran-backed Houthi rebel missile also struck a U.S.-owned ship Monday in the Gulf of Aden, according to U.S. Central Command.
By Geoff Ziezulewicz and Jon Gambrell, The Associated Press