Five Iranian Revolutionary Guard boats "harassed and provoked" three U.S. Navy ships early Sunday in international waters, the U.S. military said Monday, calling the encounter a "significant" confrontation.
An Iranian official, however, said it was not a serious incident, the state-run news agency IRNA reported.
U.S. military officials said the incident occurred early Sunday morning in the Strait of Hormuz, a narrow shipping channel leading in and out of the Persian Gulf. 
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CNN's Brianna Keilar and Charley Keyes contributed to this report.
All About Iran • International Relations
