ne of Saudi Arabia's most prominent and popular clerics has issued a stark warning to the Saudi government, saying it must take serious steps toward instituting reform, stamping out corruption and releasing political detainees "before violence is kindled"

In an open letter published online over the weekend, Salman Al-Oadah described a rising tide of anger in the deeply conservative kingdom, writing that "negative feelings have been accumulating for a long time" in Saudi Arabia.