Israeli aircraft fired on Gaza City early Thursday, witnesses said. Two air raids targeted military sites including one belonging to Hamas'' Al-Qassam Brigades, according to Palestinian (Ma''an) News Agency. There were no immediate reports of injury or damage following the attacks. An Israeli army spokeswoman did not return a call seeking comment but the reports from Gaza came soon after Israel''s army said two Grad rockets landed in Israeli territory without causing injury. One rocket landed in Kiryat Gat, near Tel Aviv, a police official said. The airstrikes were the first since Tuesday, when Israeli jet fighters struck two targets in the northern and southern parts of the enclave. No injuries were reported. The army said those attacks were in response to rocket fire that injured one person. Israel has imposed a blockade on the Gaza Strip since Hamas took control of the enclave in 2007. Rights agencies have condemned the blockade as a form of collective punishment.