(S (S (BASENP (DT The) (NN unit)) (VP (VBZ has) (VP (ADVP (RB also)) (VP (VBN attacked) (NP (BASENP (NNS terrorists)) (PP (IN near) (NP (BASENP (DT the) (NN border)) (SBAR (WHPP (IN on) (WHNP (WDT which))) (S (BASENP (NNP Osama) (NNP bin) (NNP Laden)) (VP (VBZ is) (VP (VBN thought) (S (VP (TO to) (VP (VB be) (VP (VBG hiding)))))))))))))))) (PERIOD .))