Attahullah Khogyani, spokesman for the provincial governor, says eight were wounded in Sunday's blast, which took place outside of a football stadium in the provincial capital of Jalalabad .
Khogyani says the explosion took place shortly after a pro-government rally ended at the soccer stadium.
The rally had been packed with supporters of the government.
No one immediately claimed responsibility for the bombing.
On Saturday, two intelligence service members, including the director of the Jalalabad intelligence department were killed, and 10 others, including both soldiers and civilians were wounded in multiple bomb attacks by militant Islamic State group in Jalalabad .
A local affiliate of the IS is seeking to expand its footprint in Afghanistan.