Bharati, MLA from Rupali, registered an FIR with Bhawanipur police station charging Mandal of assaulting her at their house at Bhitha village last evening, they said.
She registered the case today.
Swiftly acting on her complaint, police arrested Mandal and brought him to Bhawanipur police station for interrogation, they added.
Bharati was later referred to a higher medical centre in Patna for treatment after she received first aid at a government hospital here.
Published 15 December 2010, 10:32 IST