(S (S (BASENP (DT The) (NNS rebels)) (VP (VBP have) (VP (ADVP (RB now)) (VP (VBN been) (VP (VBN forced) (ADVP (RB back) (PP (TO to) (NP (BASENP (DT a) (JJ small) (JJ coastal) (NN strip)) (COMMA ,) (SBAR (WHADVP (WRB where)) (S (S (BASENP (QP (RB about) (NN fifty) (NN thousand)) (NNS people)) (VP (VBP have) (VP (VBN been) (VP (VBN trapped))))) (SBAR (IN after) (S (BASENP (DT the) (NN area)) (VP (VBD was) (VP (VBN evacuated) (PP (IN of) (BASENP (NN 100,000) (NNS people))))))))))))))))) (PERIOD .))