The incident took place at around 8:00 am local time in Muqer district of the province.
The provincial government media office in a statement confirmed the incident and said the explosion also left two other children wounded.
The statement further added the children were busy playing in Chambaran area of the district when they struck an Improvised Explosive Device planted by Taliban militants.
The anti-government armed militants including Taliban have not commented regarding the incident so far.
Taliban militants frequently use improvised explosive device as the weapon of their choice to target the security forces but in majority of such incidents ordinary civilians are targeted.
Source : Afghan Voice Agency(AVA)