The girl, studying in the first standard, was allegedly sexually assaulted twice on October 28 and 29, Additional Commissioner of Police (Law and Order) Alok Kumar told reporters here.
A man, who is "strongly suspected" for the offence, has been detained and is being questioned "thoroughly" with cases booked under Sections 376 of IPC and 5 and 6 of Protection of Children from Sexual Offences Act 2012.
Sec 376 of IPC relates to rape and Sections 4 and 6 of POCSO Act to punishment for penetrative sexual assault and punishment for aggravated penetrative sexual assault, respectively.
The girl's mother lodged a complaint in the Jeevanbeema Nagar police station this evening, he said.
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Kumar said the police would seek the opinion of experts on further aspects of the case. "After proper verfication, we will take a final view on the accused," he said.
The incident comes just five days after an office assistant in a school here was arrested for sexual assault of a three-and-a-half-year girl studying in nursery.
An eight-year-old girl was allegedly sexually assaulted by her 63-year-old teacher inside her school premises over a period of time. The offence came to light in early August, barely a month after the rape of a six-year-old girl at 'Vibgyor High' school here which led to street protests.