The fragile ceasefire between the U.S. and Iran is under threat of falling apart after President Trump declared that the U.S. would “guide” vessels through the Strait of Hormuz in an effort he called “Project Freedom,” to begin Monday.

In response, Iran’s armed forces said they would not allow passage to American combat forces or commercial ships without their authorization.

Tehran’s forces opened fire on U.S. warships and commercial vessels on Monday, U.S. Central Command (Centcom) head Adm. Brad Cooper told reporters. He said American forces returned fire and destroyed six small Iranian boats.

Cooper would not say whether the ceasefire between Washington and Tehran had ended.

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