Lawmakers in Kaduna State have approved surgical castration as punishment for those convicted of raping children under the age of 14.
State governor Nasir Ahmad el-Rufai needs to sign the bill for it to become law in the state.
He has previously supported castration to prevent rapists from re-offending.
The move follows public outrage over a wave of rapes, which prompted the nation’s state governors to declare a state of emergency.
Nigeria’s federal law provides between 14 years and life imprisonment as punishment, but state legislators can set different sentencing rules.