(SINV (SINV (PP (BASENP (NNS Hours)) (PP (IN before) (NP (BASENP (DT the) (NN attack)) (PP (IN on) (BASENP (DT the) (NNP al-Fakhora) (NNP School)))))) (SINV (VP (VBD was)) (NP (NP (BASENP (DT an) (NN attack)) (PP (IN on) (BASENP (NNP Asma) (NNP Elementary) (NNP School)))) (SBAR (WHNP (WDT which)) (S (VP (VBD killed) (BASENP (NN three) (JJ Palestinian) (NNS cousins)))))))) (PERIOD .))