Evacuations underway as Piha hit by flash flooding

Two bodies have been located after they were swept away in a river in the Waitakeres in west Auckland.

Police say they received a report at 5:15pm that a group had got into trouble crossing a river near Cascades Falls, Waitakere.

One person was rescued and transported to Waitakere Hospital in a moderate condition. One man who made it to safety was taken to hospital with minor injuries.

The fifth person involved was uninjured, police say.

Police and Fire and Emergency New Zealand also evacuated homes with about 100 people in them around Glenesk, Seaview and Beach Valley roads in the beach settlement of Piha.

The multiple events unfolded on Saturday afternoon after a predicted tightly wrapped low weather system passed over the Auckland region, bringing heavy rain.

The move is a precaution and the people are expected to be allowed back after a couple of hours as flooding is starting to recede.

A group of 20 people on a bush track also called police about 5:15pm, concerned they were trapped by rising water. They're in various groups and banded together in order to get out safely.

They have since found a route out of the bush and are walking out towards Glenesk Rd.

NZN / Newshub.