(S (S (BASENP (NN Three) (NNS journalists)) (VP (VBP are) (VP (ADVP (RB now)) (VP (VBN known) (S (VP (TO to) (VP (VB have) (VP (VBN been) (VP (VBN killed) (PP (IN in) (BASENP (NNP Syria)))))))))))) (PERIOD .))