Israeli Prime Minister Benjamin Netanyahu has pulled out of a US summit on nuclear security. President Obama has invited more than forty countries to Washington for the meeting beginning next week. The Israeli newspaper Haaretz reports Netanyahu backed out over fears that a group of Muslim states, including Egypt and Turkey, will renew calls for Israel to sign the international Nuclear Non-Proliferation Treaty, or NPT. The Iranian government isn’t invited to the summit but plans to host its own nuclear disarmament gathering in Tehran later this month. The theme of the Tehran summit is “Nuclear energy for everyone, nuclear arms for no one.”