The Israeli military says Israeli warplanes have destroyed offices of an armed wing of the Fatah Movement of Palestinian President Mahmoud Abbas.
Military officials say helicopters fired missiles at two offices Friday of the Al-Aqsa Martyrs Brigades in Gaza City.
Palestinian sources say there were no casualties.
Israel blamed Al-Aqsa for firing rockets at its towns and cities on Thursday. The Israeli army says one of the rockets fired from Gaza struck an Israeli factory near the town of Ashkelon and set it ablaze, injuring one Israeli.
The army says another rocket hit in the town of Sderot but caused no injuries or damage.
Some information for this report provided by AFP and Reuters.