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Iran's Supreme Leader: Nation Will Not Yield to Pressure Scattered reports also say that Iranian riot police have fired teargas to disperse planned opposition rally in front of parliament in Tehran US Lawmakers React to Obama Statement on Iran President's remarks meet with praise but also some continuing criticism from members of US Congress Iran Reviewing Ties With Britain Foreign Minister Manouchehr Mottaki says Tehran is considering whether to downgrade relations with London as dispute over Iranian government's post-election crackdown on demonstrators intensifies UN Conference Begins on Economic Reform Some researchers say developing nations are suffering but have been shut out from 'exclusive clubs' of developed economic nations, such as G8 China, US Hold Defense Talks, Plan More Officials say two countries share common concern over nuclear-weapons armed North Korea and both countries want to avoid confrontations at sea China Arrests Prominent Dissident on Subversion Charges State media say Liu Xiabo's arrest was approved Tuesday for alleged agitation activities US Embassy in Sudan Warns of Terror Threat Official statement warns radical Islamists could attack Sudanese government, Western interests Drug Trade Threatens Guinea-Bissau UN now estimates that Latin American drug gangs smuggle nearly 50 tons of cocaine through West Africa each year DC Train Crash Investigators Focus on Automated System NTSB spokeswoman says it appears operator of subway train that rear-ended another train tried to stop before crash occurred Obama: Health Care Reform Will Happen This Year US president warns that if health insurance system is not reformed, it will lead to higher costs for families, businesses 'Elephant Odyssey' Links Modern Animals to Ancient Cousins Visitors to California city of San Diego can enter world of elephants, jaguars, camels, other modern animals whose distant cousins lived in North America