Israel has rejected calls from the United Nations and others for an international investigation of its deadly raid on a Gaza-bound aid flotilla. Israel says the commandos used force only after activists on board a Turkish flagship attacked them. Nine of the activists were killed. Israel's military already is investigating the raid. An official in the prime minister's office says there is "no case in recent history" where a democratic country's army involved in the deaths of civilians in an overseas operation has been subjected to an international investigation. The official spoke on condition of anonymity pending a formal announcement by the government. He made the remarks on Thursday.