Pass out the Gas Masks.... Netanyahu promises tough response to Ahmadinejad - Yahoo! News JERUSALEM (Reuters) - Prime Minister Benjamin Netanyahu on Wednesday promised a tough response at the United Nations to the latest verbal attacks on Israeli by Iranian President Mahmoud Ahmadinejad and said he was determined to stop Iran developing nuclear weapons. Before boarding a flight to New York to address the annual U.N. General Assembly, Netanyahu issued an open letter to Israelis marking the end of Yom Kippur, the Day of Atonement, the most sacred holiday in the Jewish calendar. "On the question of Iran, we are all united in the goal of preventing Iran from achieving nuclear weaponry. On the day on which we pray to be inscribed in the Book of Life, a stage was given to the tyrannical regime of Iran which seeks at every opportunity to sentence us to death," Netanyahu said. "On Yom Kippur eve, sacred to the Jewish people, the Iranian tyrant chose to call publicly before all of the world for us to vanish. This is a black day for those who chose to remain in the auditorium and hear these hateful words." The Israeli leader did not name any U.N. member state in particular. The United States delegation chose not to attend Ahmadinejad's General Assembly speech, while other allies of Israel walked out.