Kabul, Afghanistan (CNN) -- Eight U.S. service members and an American civilian contractor were killed Wednesday in a shooting at an Afghan air force compound in Kabul, officials said. The NATO-led International Security Assistance Force in Afghanistan said an Afghan military pilot opened fire on international troops, sparking a "gunfight." The Taliban, however, claimed responsibility for the attack and said it had been working with the shooter for some time -- an assertion that NATO denied. Also denying the Taliban claim was the brother of the pilot. "My brother had no connections with the Taliban, and I deny any claims of his connection by the Taliban," Dr. Mohammad Hosain Sahebi told a local Afghan TV station in a telephone interview.
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NEW: U.S. military official: A report says the shooting occurred in a meeting room
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NEW: Two additional NATO troops are killed in separate attacks
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The nine slain at the air force compound were Americans, the Pentagon says
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The Taliban claims responsibility for the shooting
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The Taliban said the man was once a pilot in an @placeholder regime in the late 1980s and early 1990s.
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Later Wednesday @placeholder announced that two additional service members were killed in attacks elsewhere in the country, bringing the day's total number of NATO casualties to at least 11.
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There have been 36 NATO deaths in the past two years attributed to attacks by people perceived to be @placeholder soldiers or police.
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Out of 16 incidents of Afghan forces shooting @placeholder personnel that NATO has investigated, eight have been determined to be motivated by combat stress on the part of the Afghan attacker.
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Out of 16 incidents of Afghan forces shooting NATO personnel that NATO has investigated, eight have been determined to be motivated by combat stress on the part of the @placeholder attacker.