At least 2,200 American soldiers have lost their lives in Afghanistan as a result of the US - led invasion of the Asian country in late 2001, according to latest statics.According to official figures released by the website icasualties.org, a total of 26 US troops have lost their lives in war-battered Afghanistan so far this year. A total of 310 US soldiers lost their lives in Afghanistan in 2012. However, 2010 remains the deadliest year for US military casualties, with a death toll of 499. Meanwhile, the United Nations says the number of civilians killed or injured in Afghanistan has dramatically increased in the first three months of 2013 compared to the same period last year. The United Nations Assistance Mission in Afghanistan (UNAMA) spokesperson Nilab Mobarez raised the alarm on the civilian causalities on April 8. She did not reveal the exact numbers of those killed or injured, but called on all parties involved in the war to stop harming civilians. Many civilians have lost their lives in US-led operations in various parts of Afghanistan over the past decade, with Afghans becoming increasingly outraged at the seemingly endless number of the deadly assaults. Washington claims that its airstrikes target militants, but local sources say civilians have been the main victims of the attacks. The United States and its allies entered the war in Afghanistan in October 2001 as part of Washington’s so-called war on terror. The offensive removed the Taliban from power, but after more than 11 years, the foreign troops have not been able to establish security in the country.