A small Mexican Navy plane transporting a young medical patient and seven others crashed on Monday near Galveston, killing at least five people and setting off a search in waters along the Texas coast, officials said. Four of the people on board were Navy officers and four were civilians, including a child, Mexico’s Navy said in a statement. Two of the passengers were from a non-profit that provides aid to Mexican children with severe burns, including transports to a Galveston hospital.