U.S. military deaths in the Afghan war have reached 2,000, a cold reminder of the human cost of an 11-year-old conflict that now garners little public interest at home as the United States prepares to withdraw most of its combat forces by the end of 2014. The toll has climbed steadily in recent months with a spate of attacks by Afghan army and police - supposed allies - against American and NATO troops. That has raised troubling questions about whether countries in the U.S.-led coalition in Afghanistan will achieve their aim of helping the government in Kabul and its forces stand on their own after most foreign troops depart in little more than two years. On Sunday, a U.S. official confirmed the latest death, saying that an international service member killed in an apparent insider attack by Afghan forces in the east of the country late Saturday was American. The U.S. official spoke on condition of anonymity because the nationality of those killed had not been formally released. Names of the dead are usually released after their families or next-of-kin are notified, a process that can take several days. The nationality of the civilian was also not disclosed. FILE- In this file photograph made on July 29, 2010, upon landing after a helicopter rescue mission, Tech. Sgt. Jeff Hedglin, right, an Air Force Pararescueman, or PJ, drapes an American flag over the remains of the first of two U.S. soldiers killed minutes earlier in an IED attack, assisted by fellow PJs, Senior Airman Robert Dieguez, center, and 1st Lt. Matthew Carlisle, in Kandahar province, southern Afghanistan. U.S. military deaths in Afghanistan have surpassed 2,000, a grim reminder that a war which began nearly 11 years ago shows no signs of slowing down despite an American decision to begin the withdrawal of most of its combat forces. (AP Photo/Brennan Linsley, File) Close In addition to the 2,000 Americans killed since the Afghan war began on Oct. 7, 2001, at least 1,190 more coalition troops from other countries have also died, according to iCasualties.org, an independent organization that tracks the deaths. According to the Afghanistan index kept by the Washington-based research center Brookings Institution, about 40 percent of the American deaths were caused by improvised explosive devices. The majority of those were after 2009, when President Barack Obama ordered a surge that sent in 33,000 additional troops to combat heightened Taliban activity. The surge brought the total number of American troops to 101,000, the peak for the entire war. According to Brookings, hostile fire was the second most common cause of death, accounting for nearly 31 percent of Americans killed. Tracking deaths of Afghan civilians is much more difficult. Going back to the U.S.-led invasion in 2001, most estimates put the number of Afghan civilian deaths in the war at more than 20,000. The number of American dead reflects an Associated Press count of those members of the armed services killed inside Afghanistan since the U.S.-led invasion began. The 2001 invasion targeted al-Qaida and its Taliban allies shortly after the Sept. 11 attacks on the United States, which claimed nearly 3,000 lives.