"The main accused, Ayyub Kureshi confessed his crime and accepted that he was hired for throwing acid on them by the brother-in-law of the victims. After receiving an amount of 40,000 from him, Ayyub threw acid on the four women and fled," he said.
However, another accused is still absconding, he said.
Babar Jang, the brother-in-law of the victims along with another person Javed was arrested from Kandhla town ten days after the incident took place.
During interrogation, they disclosed that they had hired two persons for the purpose, police said.
The sisters, all teachers, -- Kamerjahan (26), Ayisha (25), Isha (23) and Sanam (20) -- were attacked on April 2 when they were returning from a local college after board examination duty.
Isha, who was shifted to Sir Ganga Ram Hospital in New Delhi with a badly damaged eye, was discharged on April 12 after a successful surgery which reclaimed her vision.