The service says that it arrested more than 90 Hamas operatives in an alleged plot to carry out attacks against Jews and wrest control from Palestinian President Mahmoud Abbas.
It says it also confiscated weapons and more than USD 170,000. It says the plot was orchestrated by a senior Hamas official based in Turkey and that local officials were aware.
Hamas officials had no immediate comment to the claim.
Hamas overtook the Gaza Strip in 2007 from forces loyal to Abbas. It is currently negotiating to Cairo over a cease-fire to formally end the Gaza war.