(S (S (BASENP (JJ Improvised) (JJ explosive) (NNS devices)) (VP (VBP have) (VP (VBN been) (NP (BASENP (DT a) (JJ big) (NN killer)) (PP (IN of) (NP (NP (CC both) (NP (BASENP (JJ Iraqi) (NNS civilians)) (CC and) (BASENP (JJ Allied) (NNS forces)))) (PP (IN in) (BASENP (NNP Iraq))))))))) (PERIOD .))