A girl was allegedly gang raped by four students at an apartment in the city, the police said.
The accused persons -- a bachelor of business administration and three engineering students -- were detained, senior police official Sanjiv Suman said.
They will be put under arrest after their interrogation is completed, he said on Thursday.
The girl alleged that on Tuesday, she had gone with her friends for shopping when she met one of the accused persons, he said.
The person asked her to come with him to his flat. The pretext is not yet clear, the officer said.
Mr Suman said the girl alleged that she was assaulted and raped by the youths for hours and then, they left her near the Babupurwa police station. Based on a complaint from the girl's father, a sub-inspector, a case was registered, he said.
The girl was sent for medical examination.
For more Kanpur news, click here
UP Doctors' Daughter, 16, Raped By Instagram Friend After Hookah Bar Date "Mamata Banerjee Misleading Public, Should Resign": Nirbhaya's Mother Indian-Origin Family, On Way To Daughter's College, Killed In US Car Crash Air India Cabin Crew Member Assaulted In Her London Hotel Room "We Are India's No 1...": IAS Coaching Centre Fined For "Misleading" Ad UK Girl Discovers Dinosaur Footprints On Beach Walk: "Cool And Exciting" NASA Astronaut Shares Pic Of Lightning At Night Over India Taken From Space Track Latest News Live on NDTV.com and get news updates from India and around the world.