Saudi Arabia’s crown prince, Mohammed bin Salman, has vowed to return the country to “moderate Islam” and asked for global support to transform the hardline kingdom into an open society that empowers citizens and lures investors.

In an interview with the Guardian, the powerful heir to the Saudi throne said the ultra-conservative state had been “not normal” for the past 30 years, blaming rigid doctrines that have governed society in a reaction to the Iranian revolution, which successive leaders “didn’t know how to deal with”.

Expanding on comments he made at an investment conference at which he announced the launch of an ambitious $500bn (£381bn) independent economic zone straddling Saudi Arabia, Jordan and Egypt, Prince Mohammed said: “We are a G20 country. One of the biggest world economies. We’re in the middle of three continents. Changing Saudi Arabia for the better means helping the region and changing the world. So this is what we are trying to do here. And we hope we get support from everyone.

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