Query: Who arrested Sayyid Hasan ar-Rida al-Mahdi as-Sanussi?
Context: Gaddafi took control of the Berka barracks in Benghazi, while Omar Meheisha occupied Tripoli barracks and Jalloud seized the city's anti-aircraft batteries. Khweldi Hameidi was sent to arrest crown prince Sayyid Hasan ar-Rida al-Mahdi as-Sanussi, and force him to relinquish his claim to the throne. They met no serious resistance, and wielded little violence against the monarchists.