Criminal cases have been registered against 13 police officials, including an inspector and four sub-inspectors in two different cases in Muzaffarnagar, police said.
A case of murder has been registered against six policemen for torturing one Khurshid to death in Miranpur police station on Saturday, they said.
Seven others were found guilty by a Crime Branch CID probe for allegedly killing a man, Harish Arora, in a 'fake' encounter in 1997, police said adding a criminal case has been been registered against them on Sunday at New Mandi Kotwali police station.
However, no arrest has been made so far.
A head constable, Pradeep Yadav, was also arrested in Saharanpur for his alleged involvement in a Meerut lawyer murder case.