German authorities said Wednesday they had arrested three suspected Islamic terrorists for allegedly plotting attacks on Frankfurt airport and the nearby US military base in Ramstein. Prosecutors said they had arrested three suspected members of "an Islamic-motivated terrorist organization," but gave no further details. German Defense Minister Franz Josef Jung told ARD broadcaster the three men were suspected of targeting the airport and base. "There was an imminent threat," Jung said, but declined to elaborate. The Sudwestrundfunk public broadcaster said two of the suspects had German citizenship while the third was Pakistani. Prosecutors in Karlsruhe said the arrests took place on Tuesday afternoon, and that police had also carried out searches across the country. The suspects are to be brought before a judge later Wednesday.