A Palestinian health official says at least four Palestinians from the same family were killed and 13 people were injured in the Gaza Strip by an explosion of Israeli military ordnance left over from last summer's war, AP reported. Gaza Health Ministry spokesman Ashraf al-Qidra says the ordnance exploded as Palestinian workers were helping family members remove rubble from a house destroyed in the 50-day war in the Strip. The ordnance is believed to have been dropped in an airstrike on the house during the war.