Some members of Saudi Arabia’s ruling family and business elite have expressed frustration with the leadership of Crown Prince Mohammed bin Salman following the largest-ever attack on the kingdom’s oil infrastructure last month.

It has sparked concern among several prominent branches of the ruling Al Saud family, which numbers around 10,000 members, about the crown prince’s ability to defend and lead the world’s largest oil exporter, according to a senior foreign diplomat and five sources with ties to the royals and business elite. All spoke on condition of anonymity.