The victim, a resident of Uttam Nagar and a student of class X, was taken to a house in west Delhi a week ago by the accused -- all of whom are known to her -- when she was going to school and raped in turns, police said.
Of the five accused, three are minors.
In her complaint, the victim told the police that one of the accused was carrying a pistol and threatened her with dire consequences if she disclosed the incident to anyone.
She added the accused also recorded the incident on a mobile phone.
Incidentally, the police have not yet found the gun.
The victim's parents got to know about the incident, a week after it took place, when she complained of uneasiness and was taken to a hospital.
"Two minors have been apprehended while a 20-year-old accused was arrested from their respective houses after the girl's parents approached the police. The hunt for the other two accused, who are on the run, is on," a police official said.
He added that the police are verifying all the allegations.