"The incident is inhuman and shameful. It is a shocking incident. The municipal corporation must strengthen their existing security infrastructure in the schools," she said.
The Class-II student was sexually assaulted inside the North Delhi Municipal Corporation (NDMC)-run primary school in Mangolpuri L Block allegedly by an unidentified man. The incident came to light at around 9 AM on Friday when her parents informed police about it.
Expressing her deep anguish over the incident, Ms Dikshit said the government has directed the civic body to "urgently" take stock of security situation in its primary schools in order to ensure a sense of confidence among the parents.
Education Minister Kiran Walia has also taken up the matter with mayor of the corporation Meera Agarwal.
Ms Dikshit has directed Chief Secretary DM Spolia to contact the authorities concerned in the NDMC.
The girl was taken to Sanjay Gandhi Memorial Hospital where a medical examination confirmed rape. The girl was later discharged from hospital.
"The victim was raped by a man inside the school campus yesterday. Her parents approached us this morning and a case has been registered. The victim could not tell us anything about the attacker," a senior police official said.
Enraged over the incident, people staged protests in the locality as well as near the hospital. As the protest turned violent, police used batons to disperse the crowd.
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