The incident occurred when Rupali (20) and Vikas (19) were sleeping in the compound of a college where they were shooting for the film under Rasra Kotwali police station area here when one Ajay Kumar threw acid on them, Assistant superintendent of police K C Goswami said.
Both were rushed to a nearby community health centre from where they were referred to the district hospital where the condition of Rupali was stated to be critical, they added.
Ajay Kumar, director of Bhojpuri films, had been sore with Rupali as she was working with Vikas against his wish, Goswami said adding that efforts were on to nab the culprit who is absconding.