Saudi Arabia arrests prominent preacher and scholar Safar Al-Hawali

Saudi Arabia has arrested prominent preacher and scholar Safar Al-Hawali just days after he published a book criticising the ruling family

Three of his sons – Abdul Rahman, Abdullah and Ibrahim – were also detained

Rights groups say Abdul Rahman and Abdullah were reportedly taken into custody while attending a family wedding on Wednesday

While Hawali and his son Ibrahim were arrested the following morning

Hawali became known almost three decades ago as the leader of the Sahwa movement, which advocated for democracy in Saudi Arabia

He was previously detained for opposing the ruling family

Saudi Arabia, under Crown Prince Mohammed Bin Salman, has launched a crackdown against activists, religious figures and opponents in recent months

But how far will this go