The incident took place after shooting broke out at the Afghan Interior Ministry building in Kabul.
Locals say the advisors were caught in the middle of an exchange of fire between US and Afghan forces.
Further details regarding the shooting remain unclear.
Earlier, at least another three were killed in Kunduz where police prevented protesters from overrunning a UN compound.
On February 20, US soldiers burned the copies of the Holy Quran and other Islamic texts at the US-run Bagram Airbase, southeast of the city of Charikar in the Afghan province of Parwan.
Following the Qur’an desecration US President Barack Obama sent a letter to his Afghan counterpart Hamed Karzai, apologizing for the actions of American forces in Afghanistan.
Obama told Karzai that the incident was not intentional, which has sparked angry protests against US and NATO forces in Afghanistan and other Asian countries.
More than 35 people, including two US troops, have been killed as a result of violent clashes over the past few days.
—Agencies