Gaza City ( CNN ) -- Four Israeli soldiers were wounded and five Palestinians , including a militant , were killed Saturday as the two sides traded fire . An anti-tank missile was fired at an Israel Defense Force patrol , wounding the soldiers , according to the IDF , which targeted several sites in the Gaza Strip in retaliation . Four Palestinians were killed and more than 20 wounded when Israeli tank fire hit a building east of Gaza City where hundreds of mourners were gathered for a funeral , Palestinian medical sources said . About half of those injured were in a serious condition , the medical sources said , and the number of deaths could rise . Israeli Defense Minister Ehud Barak said the country 's forces will not let `` the grave events on the border '' go unnoticed . The IDF also said it targeted a rocket launching squad in the northern Gaza Strip after it fired rockets toward Israel . More than 30 rockets fired from Gaza hit southern Israel , the IDF said . An IDF strike west of Gaza City killed a militant and wounded four , one of whom is in critical condition , according to security sources with Hamas , which has governed Gaza since 2007 . The militant was from Al-Saraya , the military wing of Islamic Jihad , they said . In a separate incident , Palestinian medical sources in Khan Younis , in the south of the Gaza Strip , said an Israeli artillery shell hit a civilian house and injured a couple and their two children . CNN 's Talal Abu Rahman , Michael Schwartz and Kareem Khadder contributed to this report .
An anti - tank missile was fired at an Israel Defense Force patrol , wounding two soldiers , the IDF said . The IDF targeted targets in the Gaza Strip in retaliation . Five Palestinians are killed , including a militant , Palestinian medics say .