(CNN) -- Iranian opposition leaders Mir Hossein Moussavi and Mehdi Karrubi and their wives were placed in a safe house for their own welfare, but they have not been arrested, Iranian government sources told CNN Saturday. "The opposition movement is very much looking for martyrs so if this is true it's for their own safety," one source told CNN. The pro-reform opposition movement "is always looking for an excuse to create something, so this may be done to keep someone from doing something to them," the source added. But the International Campaign for Human Rights in Iran expressed concern for...