(S (S (BASENP (DT A) (NN source)) (VP (VBD told) (NP (BASENP (DT the) (NNP Xinhua) (NN news) (NN agency)) (SBAR (S (BASENP (NNP Burghol)) (VP (VBD had) (VP (VBN received) (BASENP (NNS threats))))))))) (PERIOD .))