Hamas leader Ismail Haniyeh on Saturday accused Israel’s Prime Minister Benjamin Netanyahu of seeking to block a ceasefire in the Gaza war with “heinous massacres” carried out by Israeli forces, a statement by the Palestinian group said. The head of the political bureau of the group called on international mediators to act following two attacks in Gaza that Palestinian officials said killed more than 100 people. An Israeli strike on the Al-Mawasi camp for displaced persons, which Israel said had targeted the Hamas military chief, left at least 90 dead and 300 wounded, according to the health m…