Saudi Crown Prince Mohammed bin Salman pledged Thursday to strike extremists with an "iron fist", after a bombing against a gathering of diplomats was claimed by the Islamic State group. "We will continue to strike with an iron fist against all those who want to harm our security and stability," Prince Mohammed said in an address to the Shura Council, the top government advisory body, a day after Wednesday's attack in the Red Sea port of Jeddah. bur-mah-ac/hkb