Three U.S. contractors killed in 'insider attack' in Afghanistan

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Afghan Insider Attack 1/30/15
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Three U.S. contractors killed in 'insider attack' in Afghanistan
Taliban claim responsibility for Kabul attack http://t.co/Im8qVPVnxJ http://t.co/d3pGBYG5zA
Three coalition contractors and one Afghan native were killed Thursday when a gunman opened fire at Kabul International Airport.
Taliban claims killing of three #US contractors with an insidious attack in #Kabul Airport. #Egypt_Speaks http://t.co/62GOiOdCcy
Afghan Taliban claim "insider attack" at Kabul airport that left four dead http://t.co/pw8ewhTxtL http://t.co/aYYQAChk2U
Three American contractors killed in Kabul http://t.co/GgP4ZKaIZi http://t.co/XAWb6cSQJR
Afghan President Ashraf Ghani, second right, inspects guards of honor during a ceremony at the parliament in Kabul, Afghanistan, Tuesday, Jan. 20, 2015. Ghani is presenting his new nominees for Cabinet in his national unity government to the National Assembly, the Afghan parliament. (AP Photo/Massoud Hossaini)
Afghan President Ashraf Ghani, center, inspects guards of honor during a ceremony at the parliament in Kabul, Afghanistan, Tuesday, Jan. 20, 2015. Ghani is presenting his new nominees for Cabinet in his national unity government to the National Assembly, the Afghan parliament. (AP Photo/Massoud Hossaini)
Afghan guards of honor stand in formation during a ceremony at the parliament in Kabul, Afghanistan, Tuesday, Jan. 20, 2015. Ghani is presenting his new nominees for Cabinet in his national unity government to the National Assembly, the Afghan parliament. (AP Photo/Massoud Hossaini)
Afghan soldiers carry a soldier into an ambulance after he was injured by a roadside bomb explosion in Badpakh district of Laghman province, as they arrive on a helicopter at the Kabul military airport in Kabul, Afghanistan, Sunday, Jan. 11, 2015. (AP Photo/Rahmat Gul)
U.S. Maj Gen John K. McMullen, left, Brig. Philippe Lavigne, center, and Maj Gen Mehmet Cahit Bakir, right, salute during a handover ceremony, at the Hamid Karzai Airport, in Kabul, Afghanistan, Wednesday, Dec. 31, 2014. (AP Photo/Rahmat Gul)
HERAT, AFGHANISTAN - JANUARY 26: NATO soldiers attend the opening ceremony of the biggest military airport in the west of Afghanistan, in Herat on January 26, 2015. NATO Deputy Commanding General Todd T. Semonite, Commander of Army Troops Tac Muhammad Cahid and a number of NATO and Afghan soldiers attended the ceremony. (Photo by Mir Ahmad Firooz/Anadolu Agency/Getty Images)
HERAT, AFGHANISTAN - JANUARY 26: NATO Deputy Commanding General Todd T. Semonite (L 2) cuts the ribbon during the opening ceremony of the biggest military airport in the west of Afghanistan, in Herat on January 26, 2015. NATO Deputy Commanding General Todd T. Semonite, Commander of Army Troops Tac Muhammad Cahid and a number of NATO and Afghan soldiers attended the ceremony. (Photo by Mir Ahmad Firooz/Anadolu Agency/Getty Images)
HERAT, AFGHANISTAN - JANUARY 26: A soldier is seen during the opening ceremony of the biggest military airport in the west of Afghanistan, in Herat on January 26, 2015. NATO Deputy Commanding General Todd T. Semonite, Commander of Army Troops Tac Muhammad Cahid and a number of NATO and Afghan soldiers attended the ceremony. (Photo by Mir Ahmad Firooz/Anadolu Agency/Getty Images)
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(Reuters) - An Afghan soldier killed three U.S. contractors and wounded a fourth on Thursday at Kabul's military airport, an Afghan air force official said.

An increase in so-called insider attacks in Afghanistan eroded trust between government forces and their international allies in the final years of the combat mission that ended in 2014, prompting foreign forces to scale back interaction with Afghans.

The Taliban claimed responsibility for the attack saying a militant infiltrator had carried it out.

The Afghan air force official said it was not clear why the attacker had killed the advisers.

"No one else was there to tell us the reason," the official told Reuters on condition of anonymity because he was not authorized to speak to the media.

"An investigation has been opened."

The international force in Afghanistan confirmed the shooting took place on Thursday evening. It also confirmed that one Afghan had been killed but it did not specify that he was the attacker.

Despite the introduction of new measures, including a requirement that coalition forces be armed at all times and stricter vetting procedures for Afghan security members, incidents continue to occur sporadically.

One of the worst attacks took place last August, killing U.S. Major General Harold Greene, who became the most senior American military official to die in action overseas since the war in Vietnam.

The new international "Resolute Support" mission involving a small contingent of about 12,000 mostly U.S. troops started on Jan. 1 and is to focus on training Afghanistan's national security force. (Reporting by Mirwais Harooni and Jessica Donati; Editing by Gareth Jones)

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