On the contrary, Rajiva Wijesinha the permanent secretary to the Sri Lanka's Ministry of Disaster Management and Human Rights, in June 2009 said that altogether 3,000 to 5,000 civilians may have been killed during the period. In November 2011, a Sri Lankan international terrorism expert, Rohan Gunaratna, estimated the number of civilian casualties to be 1,400 (1200 killed by army cross-fire and 200 by LTTE). His estimate is in part based on information obtained from captured LTTE cadres to which he had been granted access and from coroners working in and around the no-fire zone. In February 2012, the Sri Lankan government released an official estimate of civilian deaths in Northern Province, concluding that 8,649 people have died due to extraordinary circumstances (reasons other than ageing, diseases, natural disasters etc.), in 2009. It also listed 2,635 people as untraceable. However the report did not differentiate civilians from the slain LTTE cadres. Several human rights groups have even claimed that the death toll in the last months of the war could be 70,000. The Sri Lankan government has denied all claims of causing mass casualties against Tamils, arguing that it was "taking care not to harm civilians". Instead, it has blamed the LTTE for the high casualty numbers, stating that they used the civilians as human shields. Both the Sri Lankan government and the LTTE have been accused by the U.N for war crimes during the last phase of the war.