King Salman of Saudi Arabia said on Sunday that those behind the sucide bombing that killed 21 people in a mosque will never go unpunished.
He said the mastermind and their supporters will be brought to justice.
"We were grieved by the gravity of the crime of this terrorist aggression which contradic our faith,Islam and humanitarian values",he said in a massage to the Interior Minister,Crown Prince Mohammed bin Nayef.
"Any participant,planner,supporter or sympathizer with this heinious crime will be held accountable,tried and will receive the punishment he deserves"
He said Saudi Arabia will not stop fighting terrorism.