1Saudi activists urge king to probe violations .
2A group of Saudi activists has urged King Abdullah to set up an independent commission to probe human rights violations by the nation 's powerful security agencies .
3The group -- the Committee of Civil and Political Rights -- also called on the monarch to introduce political reforms he promised when he ascended to the throne in 2005 .
4The group includes lawyers , university professors and writers and is led by university lecturer Abdul-Rahman al-Hamid .
5It was set up in October , according to its Web site .
6In a statement posted Wednesday on its web site , the group blamed the violations on the Ministry of Interior , led by the monarch 's half brother , Prince Nayef .
7It says the violations are tantamount to crimes against humanity .