evidence: Background [edit]In 1966, an agreement was reached between the governments of Pakistan and Burma during the border settlement. According to the agreement, the middle part of the Naf River sector was specified as the border between the two countries. The Naf River has twelve tributaries in Myanmar. As per the agreement, the middle part of the Naf River sector was recognized as the international boundary, so Myanmar could not take any action, which could cause major disruption in the course of the Naf River. But Myanmar ignored the agreement and built dams on eleven out of twelve rivers by 2000. Due to this, the main flow of Naf River was diverted towards Bangladesh and about 2500 acres of land was lost from the territory of Bangladesh.[citation needed] In 2000, when Myanmar attempted to build a dam at the last tributary, there were several rounds of meetings between the border guards of the two countries. When this dam was being built, it was feared that the Bangladeshi part of the Naf River would flood causing Teknaf city to disappear, so when the Bangladesh Rifles requested not to build the dam in accordance with the 1966 agreement, but the Myanmar border guards sent a letter in threatening tone. "From NASAKA HQ to BDR HQ Bangladesh. We are warning you to behave otherwise we will teach you lessons you will never forget."[citation needed]