IDF airstrikes Tuesday targeted two camps used by the Islamic militant group Hamas, Palestinian security officials said. There was no immediate word on injuries. Hamas officials said there were no casualties, but one of the airstrikes destroyed a building used by its private militia in Gaza, known as the "Executive Force." The army confirmed the airstrikes, but gave no details on the target. Earlier Tuesday, Israeli officials pledged a harsh response to a rocket attack that killed Shirel Friedman the previous night.