Police are searching for a man repeatedly exposing himself to women in Christchurch's red zone

There's been reports of a young male approaching women and in some instances assaulting them in the early hours of the morning.

Police believe the man is between 16 and 24 years old, medium height and build, with shoulder length wavy brown hair parted in the middle.

He was last seen wearing black trackpants, a black polar fleece top and a facemask.

Police say people walking in the red zone between 6 and 8.30am should remain aware of their surroundings.