In eastern Nangahar province, where Afghan and USA special operations forces have been waging a joint campaign against Islamic State fighters, another Afghan army commando - reportedly a Taliban sympathizer or member - fatally shot three US troops June 10. At least one Afghan was also killed in the incident, while another was injured.
The latest insider attack comes at a time of intensified violence and when the United States is actively considering sending more troops to Afghanistan. In March another insider attack killed three US soldiers.
"We are aware of an incident", the office said in a statement.
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The attack occurred at Camp Shaheen, which serves as the headquarters for the Afghan Army's 209th Corps in Mazar-i-Sharif.
"We are not winning in Afghanistan right now", Mattis told Congress on Tuesday, "and we will correct this as soon as possible".
The spokesman for the Taliban, Zabihullah Mujahid, claimed responsibility for the attack in a communique.
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Although Trump has delegated authority for US troop numbers in Afghanistan, the responsibility for America's wars and the men and women who fight in them rests on his shoulders.
Doctors at the city hospital said they had received the bodies of at least five police, as well as at least 30 wounded people, including 21 civilians. Pakistan's military commanders bristled at the "unwarranted accusations" and said Afghans should "look inward" to solve their insurgent problems.
Asked about the report, a Pentagon spokesman said, "No decisions have been made".
After more than 15 years of war the Taliban control broad swaths of the country and the struggling Afghan security forces continue to take an nearly unsustainable amount of casualties as they battle to hold provincial capitals.
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The Pentagon is set to announce it is sending another 4,000 USA troops to the country to counter the insurgents. The attack has caused injury to four other foreign soldiers.