Israeli soldiers and Palestinian combatants exchanged fire on the Gaza Strip borders on Tuesday after the Zionist regime\'s army launched an incursion into the Palestinian territories, witnesses and security sources said.The incursion took place to the East of the Southern town of Khan Younis, when Israeli forces, using tanks and bulldozers, conducted leveling on the Palestinian side of the fence separating the Hamas-controlled territory and Israel, Xinhua reported.The combatants blew up an explosive device and the Israeli forces responded with heavy machine-gun fire. But neither side reported casualties.