Saudi Arabia's Crown Prince Nayef bin Abdul Aziz Al Saud has died, state media say. He was 77 or 78 years old.Prince Nayef, who was also deputy prime minister and interior minister, had left the Gulf kingdom for a holiday and medical tests late last month.
On 3 June, the deputy interior minister said the prince was in good health and was expected to return home "soon".
He was named crown prince in October 2011 after the death of the previous crown prince, Sultan bin Abdul Aziz.
The succession in Saudi Arabia still passes among the sons of former King Abdul Aziz ibn Saud, who established the modern kingdom during his reign from 1932 to 1953.
Next in line is expected to be Crown Prince Nayef's younger brother, Prince Salman, who is the governor of Riyadh.