Sri Lanka president says end of current military push less than 48 hours away . The United Nations estimates that more than 50,000 civilians are trapped there . Red Cross estimates tens of thousands civilians trapped in area under siege . U.N. : `` Staff are witnessing an unimaginable humanitarian catastrophe '' Tamil Tigers have fought for an independent state in U.S. since Wednesday .
Sri Lanka president says end of current military push less than 48 hours away . Red Cross estimates tens of thousands civilians trapped in area under siege . U.N. : `` Staff are witnessing an unimaginable humanitarian catastrophe '' Tamil Tigers have fought for an independent state in U.S. since Wednesday .