A helicopter belonging to Saudi oil giant Aramco crashed on Sunday in Ras Tanura on Saudi Arabia's eastern coast on the Gulf, west of the Strait of Hormuz, killing 14 nationals, the state news agency reported, adding that the cause was unknown. "The relevant authorities have launched a full investigation to determine the cause of the crash," the state news agency added. The incident took place at 6 a.m. local time (0300 GMT), the state agency said.