German authorities have arrested a soldier linked to an alleged plot to murder a senior public figure and frame refugees for the attack. The soldier is accused of conspiring with another officer who had falsely registered as a Syrian refugee. Their plot is believed to have targeted German president Joachim Gauck and Justice Minister Heiko Maas, among others. A national debate about right-wing extremism in Germany's armed forces has flared up, especially following the revelation that the accused had written an overtly racist master's thesis.