A car packed with explosives exploded on Tuesday as it sped through a crowded market in Afghanistan's eastern province of Paktika, killing at least 89 people, officials said, one of the most violent attacks in the country in a year, Reuters reported. The huge explosion took place not far from the porous border with Pakistan's North Waziristan region, where the military has been attacking hideouts of the Pakistani Taliban 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.