There have been intense clashes between Sri Lankan security forces and Tamil Tigers in the country's north-east. The Sri Lankan defence ministry says troops have encircled scores of Tamil Tigers in a small stretch of land in Mullaitivu district. [...] Meanwhile, the World Food Programme says it has sent more than 1,000 tonnes of food to trapped civilians. [...] The World Food Programme says its food consignment on a government chartered ship comes amid increasing concern for civilians. "The government's timely provision of a large capacity vessel enabled WFP and other partners to ship this urgently needed assistance," said Adnan Khan, WFP country director for Sri Lanka. It is estimated that between 40,000 and 150,000 civilians are trapped in the conflict zone in the north-east.