In his speech at the United Nations General Assembly, Binyamin Netanyahu, the Israeli prime minister, launched a scathing attack on what he called the "Tyrants of Tehran".<br /><br />He also said that the most urgent challenge facing the United Nations today is stopping Iran from producing nuclear arms.<br /><br />Delegates from Iran were absent, as Netanyahu denounced the UN for Iranian president Mahmoud Ahmadinejad's previous speech.<br /><br />Al Jazeera's Ayman Mohyeldin reports from New York.
