(S (S (BASENP (DT A) (NNP U.S.) (NN official)) (VP (VBD said) (SBAR (IN that) (S (BASENP (DT the) (NN threat)) (VP (VP (VBD was) (VP (VBN posted) (PP (IN on) (BASENP (DT an) (NN website))))) (CC and) (VP (VP (VBD called) (PP (IN for) (BASENP (DT the) (NN attack)))) (S (VP (TO to) (VP (VB avenge) (NP (NP (BASENP (DT the) (NN imprisonment)) (PP (IN of) (BASENP (NNPS Muslims)))) (PP (IN in) (BASENP (DT the) (NNP Guantanamo) (NN detention) (NN camp))))))))))))) (PERIOD .))