Three girl students suffered third degree burn injuries on their face after a youth threw acid on them at a government pre-university college in the taluka headquarters town of Kadaba in Dakshina Kannada district on Monday, police said.

"The girls have been shifted to a private hospital after the incident, which took place when they were preparing for the Pre-University Course (PUC) exams sitting in the corridors of the college," a police official said.