Israel is also concerned about the effect a regime change would have on Egypt’s border with Gaza, where security forces have recently been working more aggressively to stop arms smuggling to Hamas. While weaponry and explosives have still made their way to the Strip, the security forces have nonetheless been effective in curbing the flow. “A change in power could change what happens on the border as well,” a senior defense official said.On Saturday night, Channel 1 reported gunfire near the border with Gaza coming from Rafah.Israeli defense sources confirmed that the IDF was not currently built to counter a military threat from Egypt and would have to restructure its divisions and the air force to effectively meet the challenge. Defense officials said there was concern that a new regime in Egypt would also cancel the joint dialogue that has dealt with key issues such as smuggling under the Philadelphi Corridor between Sinai and Gaza.