At least four militants were killed after they stormed the Education Department in Jalalabad, the capital of eastern Nangarhar province, on Monday morning.
According to Pajhwok Afghan News, the incident took place in the limits of 2nd police district of the city at around 10am.
The Governor's Spokesperson told the news agency that a suicide attacker detonated his explosives near the department and three others were shot dead by security forces soon after the explosion.
No group including the Taliban has claimed responsibility for the attack.
There was no report of other casualties.
More details awaited.