(S (BASENP (NN Police)) (VP (VBP have) (VP (VBN reported) (SBAR (IN that) (QT (DQL ``) (QTC (S (S (BASENP (DT a) (NN suicide) (NN attacker)) (VP (VP (VBD drove) (BASENP (PRPD his) (NN way))) (PP (IN into) (NP (BASENP (DT the) (JJ main) (NN gate)) (PP (IN of) (BASENP (DT the) (NN prison))))))) (COMMA ,) (S (BASENP (PRP it)) (VP (VP (VBD was) (ADJP (RB very) (JJ strong))) (CC and) (VP (VBD destroyed) (NP (BASENP (DT the) (NN gate)) (CC and) (NP (BASENP (NN two) (NNS sides)) (PP (IN of) (BASENP (DT the) (JJ surrounding) (NN wall))))))))) (PERIOD .)) (DQR ''))))))