At least 16 people were wounded after a rocket landed at Kunar governor's office in the city of Asadabad on Monday morning, Iqbal Saeed, provincial governor, said.
The incident happened in the city of Asadabad, the center of Kunar, where an event on the Holy Quran competition was underway, Saeed said.
He said that most of those wounded are students.
Security officials have not commented on the incident.
No group has claimed responsibility for the rocket attack.