Search resumes for missing teen Cassie Olczac

The 16-year-old was last seen getting off a train at Waterfall station at around 7pm on Sunday.

On Wednesday NSW Police launched a massive search in bushland in the Royal National Park with help from PolAir, the dog unit and volunteers from the SES and Rural Fire Service.

The search was expected to resume at 8am this morning.

It comes as NSW Police release the last images of Cassie as she left Waterfall station.

The images show her walking along the platform and into the station car park.

She was wearing a black hooded jumper and had headphones in.

It comes as another two women were reported missing near Waterfall on Wednesday after becoming lost during a bush walk.