School authorities evacuated everyone from the building and many of the girls were taken to hospitals.
It is still not clear who is behind the incident, but Takhar governor’s spokesman, Sulaiman Moradi, blamed “enemies of the government and the country”.
Incidents like this has become a part of a pattern of attacks on schoolgirls in the country.
Since the 2001 ousting of the Taliban, which banned education for women and girls, females have returned to schools, especially in Kabul.
But periodic attacks against female students, their teachers and their school buildings, continue.