NETANYAHU: BE READY FOR ‘PROLONGED’ WAR GAZA CITY, Gaza Strip — Signaling an escalation of Israel’s Gaza operation, Prime Minister Benjamin Netanyahu told Israelis Monday to be ready for a “prolonged” war, and the military warned Palestinians in three large neighborhoods to leave their homes and head immediately for Gaza City. The warnings came on a day of heavy Hamas-Israeli fighting in which nine children were killed by a strike on a Gaza park where they were playing, according to Palestinian health officials — a tragedy that each side blamed on the other. Israeli tanks also resumed heavy shelling in border areas of Gaza, killing five people, including three children and a 70-year-old woman, and wounding 50 in the town of Jebaliya, which was among the areas warned to evacuate, the Red Crescent said. Many Jebaliya residents said they did not dare attempt an escape. Sufian Abed Rabbo said his extended family of 17 had taken refuge under the stairway in their home. “God help us.