epa03828020 A photograph made available on 17 August 2013 shows Mohammed al-Zawahiri, brother of Ayman al-Zawahiri, the Chief of al-Qaeda, during his trial in Cairo, Egypt, 15 June 2013. Egyptian police have arrested the brother of Ayman al-Zawahiri, security sources said on 17 August. Mohammed al-Zawahiri, a jihadist who was released from prison in 2011, was arrested at a security checkpoint in Giza, south of Cairo, the sources said. EPA/AL YOUM ELSABAA NEWSPAPER