The attack near the Pakistani border also killed four insurgents.
The cost of corruption in Afghanistan rose sharply last year to $3.9 billion, and half of all Afghans bribed public officials for services.
Said participating in talks with the Taliban without the government would weaken the country and urged all to refuse those offers.
Afghan leader wants panel to decide prosecution of U.S. troops after 2014.
This option defies the Pentagon's view that thousands of troops may be needed to contain al-Qaida and to strengthen Afghan forces.
Administration could ignore commanders' recommendation to maintain a residual force, just as it did with Iraq two years ago.
Hopes Taliban freed by Pakistan will serve as peace mediators.
Insurgents remain in control of large parts of Kandahar's Zhari district.
Said the partial pull-out was an 'appropriate' move as NATO forces cede control to the Afghan military.
Taliban claim esponsibility for the suicide attack on Asadullah Khan.