(S (S (PP (IN In) (BASENP (NN addition))) (COMMA ,) (S (BASENP (NNS guards)) (VP (VP (VBP are) (RB not)) (S (VP (TO to) (VP (VB allow) (S (BASENP (NNP ICRC) (NNS staff)) (VP (TO to) (VP (VP (VB pass) (BASENP (NN mail))) (PP (TO to) (BASENP (NNS detainees)))))))))))) (PERIOD .))