A suicide car bomber has killed 89 people in a crowded market in Afghanistan's eastern province of Paktika, in one of the most violent attacks in the country in a year.
The huge explosion took place not far from the border with Pakistan's North Waziristan region.
The military has been attacking hideouts of the Pakistani Taliban in the area in the past few weeks, prompting militants to retreat towards Afghanistan.
"The number of victims may increase," said General Zahir Azimi, a defence ministry spokesman.
The attack comes at an uneasy time in Afghanistan as the country recounts votes from a disputed presidential election that the Taliban have vowed to disrupt.
But the Taliban distanced itself from the attack.
The movement's leader has ordered militants not to target civilians.
"The truth behind this attack will become clear after an investigation, but we clearly announce that it was not done by the Mujahedeen of the Islamic Emirate of Afghanistan," Zabihullah Mujahid, a Taliban spokesman, said in a statement.
"The Mujahedeen do not conduct such attacks and such attacks do not bring any benefit to them."
A local deputy police chief, Nissar Ahmad Abdulrahimzai, said police had been tipped off about the car and were chasing it when it exploded.
"The explosion was so big it destroyed many shops. Dozens of people were trapped under the roofs," said Mohammad Raza Kharoti, the district governor.
In Kabul, a remote control bomb concealed by a roadside killed two employees of President Hamid Karzai's media office and wounded five, police said.
The Taliban claimed responsibility.
The attacks took place as foreign troops are gradually withdrawing from the country.
The United Nations said last week civilian casualties jumped by almost a quarter in the first half of this year as hostilities escalate.