The incident occurred at 8:30am when two children were on their way to nearby fields to bring fodder for their cattle where they spotted a hand grenade, an official at the Saidu Teaching Hospital said.
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Further adding that one of the children picked up the grenade and it suddenly exploded, injuring both of them.
Soon after the explosion, the children were shifted to the Saidu Teaching Hospital in critical condition.
The children have not been identified yet, however, a case was filed regarding the incident and further investigations are underway, he added.
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Earlier in March, two children were killed in a mortar shell explosion in Madyan area of Swat.
According to district police officer Swat, two other children also sustained injuries in the blast.
Soon after the blast, police arrived at the site and the injured were shifted to a nearby hospital.
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