DUBAI, United Arab Emirates (AP) - A U.S. Consulate official in Dubai says an American vessel has fired on a boat off the coast of the United Arab Emirates, killing one person and injuring three.

The official gave no further details, but it appears the boat could have been mistaken as a threat in Gulf waters not far from Iran's maritime boundaries.

An Emirati rescue official confirmed the casualty toll. The officials spoke on condition of anonymity because of the sensitivity of the incident between the two allies.

The U.S. Navy's 5th Fleet, which is based in Bahrain, said it was investigating the Monday shooting.

The U.S. Embassy in Abu Dhabi had no immediate comment.