The incident took place in village Chak 10-NB in Sargodha district some 200km from Lahore, the capital of Punjab.
Deputy Superintendent of Police Abbas Shah said that the Grade-I girl student was returning from school yesterday when unidentified men kidnapped her and took her to a deserted place where they killed her after committing rape.
The perpetrators dumped her body in the fields. Some farmers found the body and alerted the police.
"We have sent the body for autopsy. We have also taken a couple of suspects in the area into custody on the complaint of the girl's father," Shah said, adding that doctors have confirmed rape.
They called for early arrest of the culprits and demanded their public hanging. They ended the protest after police high-ups assured them of justice.
Punjab Chief Minister Shahbaz Sharif has taken notice of the incident and directed the district police chief to arrest the culprits at earliest.