rtokens: The U.S. defense officials said military flights to enforce no-fly zones in both northern and southern Iraq doubled over the weekend .
pos: CC PRP VBD , " PRP VBZ JJ IN DT NN , CC PRP VBP TO VB DT , RB JJ TO VB IN DT NN PRP MD VB . "
tokens: But he added , " It is premature at this time , and I want to emphasize that , highly premature to speculate on any response we might have . "
ltokens: " These developments ... cause me grave concern , " Clinton said at a campaign stop in Troy , Tennessee .