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.

Aramco had resumed crude oil loadings ​on Friday at its Ras Tanura terminal ​in the Gulf after they were halted for nearly four months, Reuters reported.

“The relevant authorities have launched a ​full investigation to determine the cause ​of the crash,” the state news agency added.

Aramco did ‌not ⁠respond immediately to an emailed request for comment.

The incident took place at 6 a.m. local time (0300 GMT), the state agency ​said, without providing ​further ⁠details.

Saudi Arabia, the world’s biggest oil exporter, has joined a rush ​to move cargoes after Middle ​East ⁠producers ramped up oil and gas output and exports ahead of an interim deal ⁠to ​halt the war between the ​United States and Iran.