ISLAMABAD - Some unknown militants blew up a primary school in Pakistan's northwest tribal area of Khyber Agency on Monday morning, bringing the total number of destroyed schools in the area to 68, local media reported.

Quoting political administration, local Urdu TV channel Dunya reported that the militants destroyed the school by fixing explosive materials inside the building and later blowing them up with remote controlled device in Akka Khel area of Khyber Agency, a restive tribal area at Pakistan-Afghanistan border.

The school was closed at the time of explosion. No casualty has been reported yet.

The militants fled the scene following the incident.

No group has claimed responsibility for the incident yet.

The militancy in the area has taken a toll on kids' education. Thousands of children are out of schools in Khyber agency as militants frequently blow up educational institutions in the area.

Earlier on Oct 8, two schools were blown up by insurgents in two separate villages of the agency.