Provincial criminal investigation director Qudratullah Arabzai said today that the primary school, 65 kilometers from the capital Kabul in Logar province, was under renovation.
He said the school, tents, chairs, generator, and a vehicle were destroyed in the fire late yesterday.
At least 23 people have been killed in a surge of violence in Afghanistan over the past several days.
In Kabul today, the Afghan election commission said final results from September's parliamentary polls are being delayed because of complaints of fraud. Final results are now expected sometime next month.
The former Taliban regime banned education for women.