A woman in her 20s has become the victim of a serious sexual assault in Radlett early this morning (Thursday).

Herts Police are investigating after the woman was attacked in a grass area in a green space near to the Esso petrol station on Watling Street at around 2am.

A spokeswoman said the park remains cordoned off as investigators are at the scene, and inquiries are continuing to find the attacker.

Anyone who has any information about this incident is asked to contact Herts Police on 101.