This stage of the war was marked by increased brutality against civilians and rapidly mounting civilian casualties. On 19 February 2009, Human Rights Watch issued a report accusing the Sri Lankan army of "slaughtering" the civilians during indiscriminate artillery attacks (including repeated shelling of hospitals) and calling on the Sri Lankan government to end its policy of "detaining displaced persons" in military-controlled internment camps. Human Rights Watch also urged the Tamil Tigers to permit trapped civilians to leave the war zone and to "stop shooting at those who try to flee". The UN was also concerned over the condition of internally displaced persons and estimated that some 200,000 people were being squeezed into a narrow 14 square kilometre patch of land on the coast in Vanni, which the government had declared the 'no-fire zone'.