Jerusalem ( CNN ) -- Israeli Defense Minister Ehud Barak said Sunday that Israel was willing to stop attacks on Gaza if the Palestinians stop firing into southern Israel . `` If they stop firing at our communities , then we will stop firing . If they stop firing altogether , then there will be quiet , '' Barak said in an interview on Israel Radio . But Prime Minister Benjamin Netanyahu warned shortly afterward that the converse was also true . `` Our policy is clear . If attacks against Israeli civilians and Israeli soldiers continue , the response will be very harsh , '' he said before the weekly Cabinet meeting Sunday . Barak 's offer comes after a particularly intense few days of hostilities following a Hamas rocket attack on an Israeli bus that left a teenager critically wounded on Thursday . Netanyahu said Sunday the victim , Daniel Wiliech , `` is fighting for his life . We , along with the entire nation , pray for him . '' Israel responded with a series of strikes on Gaza that has left at least 18 people dead , the largest number since a major Israeli incursion into the territory in 2008-09 in response to Palestinian rocket attacks . Palestinian Authority President Mahmoud Abbas Saturday called for an emergency meeting of the Arab League in the face of the upsurge in violence , according to the official Palestinian news agency . The Arab League plans to request that the United Nations Security Council `` consider the aggression against the Gaza Strip '' and impose a no-fly zone over Gaza to protect civilians , Hisham Yousef , the Arab League 's chief of staff , said Sunday . Palestinians fired nine mortars and rockets into Israel Sunday morning , police spokesman Micky Rosenfeld said -- a significant drop from the level of the past few days . On Saturday , the Israeli air force struck and killed three Hamas personnel in southern Gaza , according to both the Israeli military and Palestinian medics . The Israel Defense Forces said the people were a senior Hamas military wing leader and his two bodyguards . In another incident , a Palestinian man died of wounds in an early evening airstrike in the Zeitoun area of Gaza City . Rosenfeld said about 42 rockets and mortars were fired into Israel on Saturday , including 10 longer-range Grad rockets , but no injuries were reported . The military put the number of rockets and mortars fired Saturday at 50 . It said aircraft and armored forces targeted 11 squads of `` terrorists '' in the northern and southern Gaza Strip and 15 `` terror activity sites , '' including `` terror infrastructure sites , Hamas outposts , smuggling tunnels and weapons manufacturing and storage facilities . '' The three-day death toll in Gaza includes at least 10 militants and eight civilians . On Friday , Israeli Prime Minister Benjamin Netanyahu said the attack on a civilian bus `` crossed the line '' and that `` whoever tries to hurt and murder children will have no immunity . '' In a Friday letter to the U.N. Security Council , Riyad Mansour -- Palestinian ambassador to the United Nations -- charged Israel with using `` indiscriminate and excessive force '' and asked for the world body to intervene to `` prevent the slaughter of more innocent civilians . '' A Hamas official vowed Saturday to widen the scope of the group 's attacks on Israel if Netanyahu did not agree to halt airstrikes on Gaza . Hamas spokesman Sami Abu Zuhri blamed Israel for the surge in violence and said Hamas would do what was needed to protect Palestinians in Gaza . Abu Obeida , spokesman for the Hamas military wing , the Ezzedeen Al-Qassam Brigades , told reporters in Gaza City on Saturday that his group would continue to wage a fight until Palestinians cast off the Israeli occupation and wrested away their lands . He said it was impossible to speak about any sort of calm between Hamas and Israel while there was aggression being committed against the Palestinian people . Israeli officials have cited various precautions to avert casualties . They include early warning systems , road closures near the Gaza border and the use of bomb shelters , police spokesman Rosenfeld said . The Israeli military said Saturday that its newly deployed anti-rocket defense system known as the Iron Dome successfully intercepted Grad rockets that had been fired from Gaza Friday and Saturday . Over the past 48 hours , `` terrorist organizations '' in Gaza had fired more than 120 Grad missiles , rockets and mortars at Israel , the IDF said . In a statement released Saturday , the Israeli military said it `` continued striking terror sites in the Gaza Strip '' in coordination with Israel 's domestic security agency , the Shin Bet . Journalist Talal Abu Rahma contributed to this report .
NEW : The Arab League plans to ask for a no-fly zone over Gaza . Prime Minister Netanyahu says a teen hit in a bus attack is fighting for his life . Netanyahu warns that Israel will strike back hard if attacks continue . At least 18 Palestinians have died in Israeli strikes since the Hamas attack on the bus .