(S (S (PP (VBG According) (PP (TO to) (BASENP (NNS reports)))) (COMMA ,) (S (S (BASENP (EX there)) (VP (VBD was) (NP (BASENP (DT an) (NN exchange)) (PP (IN of) (BASENP (NNS gunfire)))))) (CC and) (S (BASENP (NNS explosions)) (VP (VBD were) (VP (VBN heard) (PP (JJ due) (PP (TO to) (NP (BASENP (DT a) (NN car)) (VP (VBG being) (VP (VBN blown) (PRT (RP up)))))))))))) (PERIOD .))