A schoolgirl kneed a man in the genitals and fled after he indecently assaulted her.
Police are looking for the man after the attack on Mackay St in Thames about 2pm on Tuesday.
"Our victim, a 16-year-old girl, was walking on the eastern side of Mackay St, towards Sealy St, when a man walking towards her suddenly stopped her and subjected her to an indecent assault," Detective Sergeant Martyn Hughes said.
"Keeping her wits about her, our victim has kneed her attacker in the genitals before fleeing and raising the alarm."
The offender was described as a clean-shaven man in his late 20s with olive skin who was "reasonably tall" and wearing a black T-shirt and blue jeans.