This large report documents a selection of the large scale massacres of the Tamil people committed by the Sri Lankan State sponsored forces. Prior to the signing of the internationally brokered February 2002 ceasefire agreement, there have been hundreds of such massacres. After a two year lull, the violent campaign by the military was re-launched in 2004. The events of early 2009 that are the subject of many investigations are not covered in this report. NESOHR was forced to stop functioning in Vanni by the end of 2008 due to the prevailing situation of massive displacement and incessant and indiscriminate artillery attacks and aerial bombardments. We therefore did not collect on the spot reports of the events in 2009. We have added a very brief note and some pictures from this period at the end. From 1987-1989 the Indian forces that were stationed in the Tamil homeland were also responsible for a large number of massacres. These are also documented separately at the end of the book as Part II.