The attack is the deadliest in Afghanistan this year. It happened in eastern Paktika province, bordering Pakistan, during the final of a three-day tournament with a huge crowd in attendance.
The spokesman for the provincial governor, Mokhlis Afghan, says that 42 people were killed immediately when the attacker detonated explosives as he mingled with the large crowd.
There is still some confusion about the exact number of dead and wounded, he says.
Afghanistan has been tackling insurgents for more than a decade, but attacks have been escalating this year. No claim of responsibility has been made for Sunday’s attack.
Sunday’s attack comes the same day the nation’s parliament agreed to allow U.S. and NATO forces to remain in Afghanistan after 2014.
It’s unusual for an attack in Afghanistan to kill so many people.
Only a few comparable incidents come up in the University of Maryland’s Global Terrorism Database, which tracks acts of terror from 1970 to 2013.