A Saudi prince was killed on Sunday when a helicopter with several officials on board crashed near the kingdom’s southern border with war-torn Yemen, state television said.

The news channel Al-Ekhbariya announced the death of Prince Mansour bin Moqren, the deputy governor of Asir province and son of a former crown prince.

It did not reveal the cause of the crash or the fate of the other officials aboard the aircraft.

A Middle East Eye source in Saudi Arabia, however, said that Mansour was trying to flee the country at the time when his helicopter went down. He was a known opponent of Crown Prince Mohammed bin Salman.