The girl was missing from her house since yesterday evening. She was later found lying and crying in bushes near rail line by a passer-by, a senior police officer said.
The girl, a resident of JJ cluster in Keshav Puram area, was raped as she was bleeding profusely. She was rushed to Mahavir Hospital, from where she was referred to Safdarjung Hospital where she is undergoing treatment, the officer said.
"She is admitted in the High Dependency Unit. She is conscious and out of danger but still in pain," medical superintendent of Safdarjung hospital, A K Rai, said.
The girl, whose father is a painter, was playing outside her house when she went missing. Her grandparents tried to search her, but she could not be found, police said.
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A case under relevant sections of IPC and POCSO (Protection of Children from Sexual Offences) Acts has been registered and a manhunt has been launched to arrest the accused, who are yet to be identified, he said.
"We have zeroed in on some suspects and we are keeping a watch. Once the girl recovers, we will be able to get more clues about the accused," the officer added.
Meanwhile, the Delhi Commission for Women (DCW) chairperson Swati Maliwal met the victim at the hospital.
"Visited the little girl, her condition can't be described. Horrific. Her parents are extremely poor. When will this heinous crime stop in Delhi (sic)," Maliwal tweeted.
"In 2014, only 9 accused were convicted in Delhi in crime against women. Can you imagine! Tabhi to Delhi mei kisi ko darr nai hai (That's why no one is scared in Delhi)," she tweeted.