It should be noted that some of the mass graves discovered were dated to the 1936 Palestinian uprisings against the British occupiers who were allowing mass Jewish immigration into the area...though I hope predominantly they rebelled just because they didn't want to be ruled (especially by outsiders).
http://uruknet.info/?p=m98012&hd=&size=1&l=e
 

 its not the first crime ,for over one hundred years the zionist movment sponsered by the western "civilized "world had commited thousands and thousnds of crimes against the arabs of palestine and the whole world....................................................