According to an FIR lodged by the father of the girls, his four daughters went missing on August 20 as they did not return from their school in Indira Puram area here.
However, family's neighbour Rehmat Saifai saw two of the daughters yesterday and brought them back to their residence, police said, adding, the other two returned on their own by evening.
Narrating their ordeal to the parents, the daughters said that one of their neighbours, Nafees met them along with his three friends when they were on their way back from school, they said.
The elder daughters, aged between 15 and 16 years, were then gangraped by the four after giving them sedative laced drinks, police said.
An FIR has been lodged under Section 376 of the Indian Penal Code (rape) against the accused, Police Station Officer, Indira Puram, Hari Dayal Singh Yadav said, adding, efforts are on to nab them.