Gaza City ( CNN ) -- A cease-fire did n't last very long Thursday as more than a dozen rockets from Gaza were fired at southern Israel and the Israeli air force hit what it labeled as seven terror sites , according to Israel Defense Forces . Of the 18 rockets fired , eight struck Israel and eight landed in Palestinian areas , IDF tweeted . Two were shot down , Israel said . Palestinian security officials told CNN that Israeli warplanes bombed a training base of al-Qassam Brigades -- the military wing of Hamas -- while another targeted an old intelligence building . There were no casualties , the officials reported . IDF said it attacked four sites in the southern Gaza and three in northern Gaza . `` Militants attacking Israel from the Gaza Strip will not feel safe , will pay the price and will find that their actions are futile , '' Lt. Col. Peter Lerner , a spokesman for IDF , tweeted . There was news earlier of an Egyptian-brokered truce . Islamic Jihad Khaled Al-Batash told CNN the truce started at 3 p.m. local ( 9 a.m . ET ) . Two hours later , two rockets were fired from Gaza , Israeli police spokesman Micky Rosenfeld said . Palestinian leader blames Israel . Israelis have been preparing for continuing violence , with IDF calling up reservists to man Iron Dome batteries that are intended to intercept missiles from Gaza , according to a spokesman . They intercepted three such missiles Wednesday night and the two Thursday . Another spokesman said the reserves were being brought in for `` operational assessment and accordance with the air force necessities . '' Islamic Jihad said the flare-up came after three of its operatives were killed Tuesday by an Israeli military strike in Gaza . The operatives had traveled to Gaza to inspect an Israeli drone -- a small surveillance aircraft -- that had become disabled , Islamic Jihad said . Palestinian Authority President Mahmoud Abbas blamed the Israelis for the outbreak . `` The Israeli occupation forces killed in cold blood three Palestinians in the West Bank and another three in Gaza , and we did not hear any condemnation or any apologies to these acts from the Israeli government , '' he said Thursday in a joint news conference in Bethlehem with British Prime Minister David Cameron . `` And , yesterday , the launching of rockets happened from Gaza and Israel retaliated to that , and we condemn this escalated military aggression in all its forms , including the firing of rockets , '' he told reporters , according to the Palestinian news agency WAFA . Israeli Defense Minister Moshe Yaalon blamed the attacks on Hamas , which has governed Gaza since 2007 , two years after Israel disengaged unilaterally from the area . `` The Hamas is responsible for Gaza and if the Hamas does not know how to ensure the quiet , they will also be responsible , '' he said in Hebrew . `` We are prepared for all possibilities . '' Only a few days ago , Egypt declared Hamas a terrorist organization and outlawed its activities in the country . This followed the military-backed government 's fierce crackdown on the Muslim Brotherhood , which is linked to Hamas . Airstrikes , rocket fire . Israeli Foreign Minister Avigdor Liberman told Israeli army radio that `` the position of my party Israel Beitanyu is that we support the full occupation of the whole of Gaza in any possible future action . '' Liberman opposed a response short of full occupation . `` I am against a limited operation , '' he said . Prime Minister Benjamin Netanyahu was asked Wednesday evening for his reaction to Liberman 's comments at a joint news conference with Cameron in Jerusalem . `` If it is not quiet in southern Israel , it will be very noisy in Gaza , '' Netanyahu said in Hebrew . The announcement of the cease-fire came shortly after four Palestinian residents were critically wounded in an airstrike on tunnels near the southern Gaza city of Rafah , Palestinian medical sources told CNN . A Hamas website reported five people were injured in two attacks . Security sources said one of the attacks struck west of Rafah , destroying two tunnels ; a second attack struck east of Rafah on open land . Israel Defense Forces said that two rockets hit southern Israel Thursday and that the country 's air force retaliated `` by targeting seven terror sites '' in southern Gaza . Since Wednesday , about 65 rockets have struck Israeli territory , five of them hitting populated areas , IDF said . Lerner said Thursday in a statement that there had been `` a substantial deterioration '' in the safety of southern Israel 's residents . `` We have responded and will continue to do so in order to eliminate threats as they develop . This is our obligation and responsibility to those exposed to Gaza terrorism . '' Israel intercepts ship with weapons headed to Gaza . Israel says it regrets killing of Palestinian judge from Jordan . Israel approves permits for new settlements in East Jerusalem . What else is on the minds of Israelis in 2014 ? CNN 's Talal Abu Rahma reported from Gaza , Kareem Khadder from Jerusalem and Tom Watkins from Atlanta . CNN 's Hamdi Alkhshali , Mike Martinez , Salma Abdelaziz , Mohammed Tawfeeq and Michael Schwartz contributed to this report .
Israelis say 18 rockets fired from Gaza , and IDF hit seven targets . There had been talks of a truce , but hostilities started just hours later . Israel says militant actions are futile ; Palestinian Authority says Israel is to blame for them . Some Palestinian civilians are critically wounded .