After Israel shut off communications to Gaza on Friday, the United States pressured the Israeli government to switch them back on, according to a senior U.S. official, who spoke on the condition of anonymity to discuss sensitive negotiations. “We made it clear they had to be turned back on,” the official said, adding that the Israelis did not give a reason why they had switched off communications networks in Gaza, causing a near-total blackout. “The communications are back on. They need to stay back on.” Israeli Prime Minister Benjamin Netanyahu, who said the “second stage” of war against Hamas was underway, apologized Sunday after appearing to blame the country’s security establishment for Hamas’s deadly attacks inside Israel this month.