Two nurses were attacked by a knife-wielding man as they made their way to work at Waikato Hospital last night.
Detective Constable Lucy Southall said the nurses had parked their car on nearby Horne St when a man suddenly knocked on the driver's window shortly after 10pm.
"The man then opened the car door and threatened the pair with a knife before telling the women to get out."
The driver kicked at the attacker and both women refused to leave the car.
"After a short while the attacker fled the scene in the direction of the hospital and the Pembroke, Selwyn St intersection."
Ms Southall said a couple seen walking down Horne St at the time may hold the key to unlocking what happened, and police wanted to hear from them.
Anyone with information was urged to contact Hamilton police on (07) 858 6200 Crimestoppers anonymously on 0800 555111.