A woman was found hanged from a tree in India's state of Uttar Pradesh on Thursday and another was allegedly raped in a police station, police said, the latest incidents in a wave of crimes against women reported in the country's most populous region over the past two weeks.

Police suspect the hanged woman was raped before being murdered, bringing to five the number of rapes reported in the past 36 hours in the state, including two women who were then murdered.

"The sub-inspector accused of committing the rape of the woman has been put under arrest while we have launched a manhunt for the three constables accused of being party to the crime," a spokesman at state police headquarters said.