Police arrested 561 people Saturday in the capital of Riyadh . Saudi Arabia launched a `` security campaign '' this month to crack down on workers violating visa rules . The arrests were part of a crackdown on dissent following an attack by Shiite militants that killed 21 people.
Police arrested 561 people Saturday in the capital of Riyadh . The arrests were part of a crackdown on dissent following an attack by Shiite militants that killed 21 people.