No group has yet claimed responsibility for the bombing, but Afghan President Ashraf Ghani has accused the Taliban.
On Sunday, the death toll has risen and about 60 people are said to have died so far.
At school, both girls and boys receive teaching in shifts and on Saturday it was the girls' teaching day.
One week ago, the United States and NATO began withdrawing their remaining troops in Afghanistan.
Which, according to Reuters, has led to increased violence between government and Taliban groups.
Escalating violence for several years
Anna Ek, Sweden's head at SAK, says that US withdrawals can contribute to an increase in violent attacks, but such an escalation has been seen for several years.
- Violence has escalated in the last ten years, the civilian population has been hit extremely hard.
It is clear that there is a risk that the violence will escalate further now that the United States is leaving.
"The most important thing is not to give up"
She emphasizes the importance of not giving up the work for peace in Afghanistan, and not to forget the progress made in the country over the past twenty years.
For example, millions more children go to school, and the number of girls who go to school has also increased.
- The most important thing is that the environment does not give up, but continues to put pressure on the parties to the conflict so that there is a ceasefire. On occasions like this, you feel sad, but also that the work must continue, says Anna Ek.