City police probing the violence on 07.01.2015 in Hosa Guddadahalli and J.J. Nagar have detained more than 20 people from the two localities in connection with rioting.
They are also analysing the video footage to identify those involved in rioting, stone-pelting and other activities.
Police had recorded the violence with six handicams.
Meanwhile, a day after a mob ransacked the school, resulting in violence, the streets near the school in Hosa Guddadahalli off Mysuru Road wore a deserted look as prohibitory orders were in place.
Several students of other schools skipped schools fearing violence.
A resident near the school, said: Police asked me to stay indoors and did not even allow me got to the main road to pick up the morning newspaper.
A senior police official involved in the probe said that the girl, in her statement, told that physical education teacher Ramakrishna had dragged her into a store room, undressed her and tried to fondle her. When she started crying, he let her go out.
The official added that the girl did not have any physical injury.
A woman police official, who spoke to the girl, said that it was common that the victims of sexual assault, especially small children are not able to put forth a coherent narrative due to stress.
The girl is being taken into confidence through counselling and police have also taken the help of experts from NIMHANS.