The four and two others had thrown acid at the 17-year-old victim's face, stabbed and attempted to strangle her and left her to die on May 6 at Mathia Naharpur as she wanted to marry a man of her choice, Superintendent of Police Vinay Kumar told a press conference here.
The girl, however, gave a statement to the police blaming her boyfriend and friends after she was admitted to a hospital by local people who found her.
Her father Chhabila Mahto, two of her uncles Rajendra and Narayan Mahto and brother-in-law Krishna Mahta were arrested from places under Sangrampur and Kalyanpur police station areas while the police were looking for the two others, the SP said.
An acid bottle, a blade, blood-stained clothes and related evidence were seized, Kumar said.
The condition of the girl who was referred to the Sri Krishna Medical College and Hospital at Muzaffarpur from a government hospital was stable, hospital sources said.