“A veteran Afghan military pilot said to be distressed over his personal finances opened fire at Kabul airport after an argument Wednesday, killing eight U.S. troops and an American civilian contractor.
Those killed were trainers and advisers for the nascent Afghan air force. The shooting was the deadliest attack by a member of the Afghan security forces, or an insurgent impersonating them, on coalition troops or Afghan soldiers or policemen. There have been seven such attacks so far this year.”
(Source: Afghan officer opens fire, kills 9 Americans – Yahoo! News.)