(S (S (BASENP (NNS Investigators)) (VP (VBP say) (SBAR (S (NP (EX there)) (VP (VP (VP (VBD were) (BASENP (NN ten) (NN bullet) (NNS casings))) (PP (IN at) (BASENP (DT the) (NN scene)))) (PP (IN from) (BASENP (DT a) (JJ semiautomatic) (NN firearm)))))))) (PERIOD .))