Quote Originally Posted by Carl
I reguarly see AI spies stand up i cities they are allready in and then dissappear back into it. they don't leave they just re-enter it, bu my own only do that if I order them to.
I think that's just spies being kicked out of your city at the end of your turn and then reentering it at the AI's turn. You should get a "spy found but escaped" message next turn.