Both India and Pakistan claim sovereignty over the entire Siachen region. U.S. and Pakistani maps in the 1970s and 1980s consistently showed a dotted line from NJ9842 (the northernmost demarcated point of the India-Pakistan cease-fire line, also known as the Line of Control) to the Karakoram Pass, which India believed to be a cartographic error and in violation of the Shimla Agreement. In 1984, India launched Operation Meghdoot, a military operation that gave India control over all of the Siachen Glacier, including its tributaries. Between 1984 and 1999, frequent skirmishes took place between India and Pakistan. Indian troops under Operation Meghdoot pre-empted Pakistan's Operation Ababeel by just one day to occupy most of the dominating heights on Saltoro Ridge to the west of Siachen Glacier. However, more soldiers have died from the harsh weather conditions in the region than from combat. Pakistan lost 353 soldiers in various operations recorded between 2003 and 2010 near Siachen, including 140 Pakistani personnel killed in 2012 Gayari Sector avalanche. Between January 2012 and July 2015, 33 Indian soldiers lost their lives due to adverse weather. In December 2015, Indian Union Minister of State for Defence Rao Inderjit Singh said in a written reply in the Lok Sabha that a total of 869 Army personnel have lost their lives on the Siachen glacier due to climatic conditions and environmental and other factors till date since the Army launched Operation Meghdoot in 1984. Both India and Pakistan continue to deploy thousands of troops in the vicinity of Siachen and attempts to demilitarise the region have been so far unsuccessful. Prior to 1984, neither country had any military forces in this area.