A small Mexican Navy plane transporting a young medical patient and seven others crashed Monday near Galveston, killing at least five people and setting off a search in the waters off the Texas coast, officials said.

Four of the people aboard were Navy officers and four were civilians, including a child, Mexico’s Navy said in a statement to The Associated Press. It was not immediately clear which of them were confirmed dead by U.S. Coast Guard Petty Officer Luke Baker.

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