(S (S (BASENP (DT This)) (VP (VBD happened) (SBAR (BASENP (DT a) (NN day)) (SBAR (IN after) (S (BASENP (NN 21) (NNS people)) (VP (VBD were) (VP (VP (VBN dragged) (PP (IN off) (BASENP (NNS buses)))) (CC and) (VP (VBN killed) (PP (IN in) (BASENP (NNP Diyala) (NN province))))))))))) (PERIOD .))