The head of Afghanistan's Independent Election Commission (IEC) and his deputy have resigned, officials say.
A spokesman for President Hamid Karzai said commission president Azizullah Ludin's tenure had ended and that he did not want to continue in the post.
The commission's chief electoral officer, Daoud Ali Najafi, has also submitted his resignation.
The resignations follow international pressure over last year's presidential elections which were marred by fraud.
Mr Karzai won the election but the IEC was criticised for failing to deal with widespread irregularities. David Loyn reports.