Palestinian militants in Gaza fired rockets at Jerusalem Sunday for the first time since conflict escalated, as Israel bombarded Islamic Jihad positions for a third day in violence that has left 29 dead.The updated count from health authorities in the Islamist-run enclave said six children were among those killed since the start of the "Israeli aggression" on Friday, in addition to 253 people injured.On Sunday Israel pressed on with its bombardment of positons of Islamic Jihad militants who have retaliated with barrages of rockets.