Three American contractors were killed in an apparent insider attack in the Afghan capital Kabul, an Afghan air force official told Reuters news agency.
"It is unclear yet why he shot these advisers and no one else was there to tell us the reason," the official said, asking not to be named because he was not authorised to give statements to the media.
"An investigation has been opened."
"It is unclear yet why he shot these advisers and no one else was there to tell us the reason," the official said, asking not to be named because he was not authorised to give statements to the media.
"An investigation has been opened."