Tuesday’s attack in Kabul may have killed members of NATO, which has a base in the airport.
Hot air balloons rise during a mass ascent at the International Balloon Fiesta, one of the largest such festivals in Europe with attendance over 100,000, near Bristol, England on August 7.
The attack, which killed at least 90 people near two Taliban-hijacked trucks, is a setback for NATO's push to limit civilian deaths.
The assassination of a high-ranking official underscores the strength of the Taliban in Afghanistan.
Gen. Stanley McChrystal submitted his recommendations Monday for a revised strategy to turn around the conflict.
The top commander in Afghanistan reportedly likens the US military to a bull charging at a matador and getting weaker with each cut.