A woman has been sexually assaulted in an early morning attack near Waikato Hospital in Hamilton.
The attack happened when the 31-year-old walked through the carpark of St Stephens Church on Ohaupo Rd about 4:30am on Monday, police say.
She was grabbed from behind by a man who threatened her before sexually assaulting her, Detective Sergeant Terri Wilson says.
"There is a possibility there were people in the area at the time of the incident who may have seen either the victim or the offender.
"We really want to hear from anyone who may have information to help us in our investigation."