It is said that at around 11.30 pm the girl had been waiting outside the Manipal University library, when an auto with four men came and stopped near her. The men, all said to be auto drivers, allegedly took her away forcibly and sexually assaulted her.
The identities of the men are not yet known, but the police is hopeful of catching them with the help of CCTV footage.
The girl was admitted to hospital.
Investigations are on.