The accused identified as Babar Jung, Javed, Kallu and Ayyub alias 'Badru' have been chargesheeted under various sections of the IPC, Deputy Superintendent of Police, C P Singh said, adding that they have been taken under police custody.
Police arrested Baber Jung, who is also the brother-in-law of the victims, his friend Javed and two others, Kallu and Ayyub hired for Rs 40,000 to do the job.
Kamerjahan (26), Ayisha (25), Esha (23) and Sanam (20), all teachers, were attacked when they were returning from Hindu inter-College in Kandhal town after UP board exam duty on April 2.
A local court had earlier rejected their bail petition.