All three accused have been arrested, they said, adding further investigations were going on.
The victims, aged 14 and 15 years, had gone for some work and while they were returning home they were gangraped by Rajpal, Mahipal and Sanjay, police said.
Meanwhile the IG of Agra Zone, Ashutosh Pandey has announced a cash reward of Rs 10,000 for the police team which arrested the accused.