Egyptian security forces arrested Saturday six Muslim Brotherhood (MB)-linked elements suspected to be involved in police colonel Wael Tahoon's assasination, sources told Al Bawaba News. Two anonymous assailants shot Tahoon, a public security sector colonel, and his driver killed April 21 while on their way to work.The detainees are currently being investigated, the sources added. An MB-linked terrorist group claimed responsibility for the killing, according to Al-Bawaba News.