In Mau, FIR has been registered against seven persons including B K Singh, his son Jaywardhan Singh, Ranjit Singh, Mathura Rajbhar, Nagina Singh and Akash Singh and one unnamed, police said.
Nagina Singh today surrendered in the court and was sent to jail on 14 days judicial custody,
IG zone, Varanasi Amrendra Sengar said that all the accused will be arrested soon.
An 18-year-old rape victim was shot dead by motorcycle- borne youths yesterday at Baijapur village in Mau district, two days before she was to appear in a court as witness in her case.
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The girl was raped on June 6, 2011, allegedly by B K Singh, manager of a college, the police said. The case was being heard in the local court. The victim's family members alleged that she was killed on the directions of the rape accused, they said.
In Sitapur district, main accused Pradeep and Bhagwati were arrested in connection with the murder of a 23-year-old woman in Mahmudpur village.
"Pradeep and Bhagwati have been arrested. While one accused is it at large," Station Officer, Maholi, Rang Bahadur said.
The accused Pradeep had come out of jail about two months back and was pressuring the woman to withdraw her complaint, the police said.
Yesterday's twin attacks were condemned by Opposition Congress which slammed the SP government for the "increasing lawlessness" in the state.