Refugees live in mud flows , or from flooded areas , internal affairs memo says . More than 300 people protest conditions , memo says . Flooding comes ahead of Sri Lanka 's monsoon season . An internal U.N. memo obtained by CNN painted a dismal picture for the refugees , who have been caught in mud flows and the runoff from flooded latrines . Human Rights Watch has called for immediate release of Tamil prisoners at camps .
Refugees live in mud flows , or from flooded areas , internal affairs memo says . More than 300 people protest conditions , memo says . Flooding comes ahead of Sri Lanka 's monsoon season . Human Rights Watch has called for immediate release of Tamil prisoners at camps .