Saudi authorities have detained three princes including King Salman's brother and nephew on charges of plotting a coup, the US media reported Friday. The crackdown is seen as a power play of Crown Prince Mohammed bin Salman, the heir to the Saudi throne.

Officials said that King Salman’s brother, Prince Ahmed bin Abdulaziz al-Saud, his nephew Prince Mohammed bin Nayef, as well as Nayef’s younger brother, Prince Nawaf bin Nayef, were detained after being accused of plotting a palace coup aimed...