Two people have died after a landslide hit their home in New Zealand and authorities are searching for several others feared dead in another slip nearby. Here's how landslides occur, the warning signs and where they are most common.

The cost of stabilizing the landslides in the Grovemont neighborhood in Swannanoa is estimated to cost $18.3 million. Buncombe County officials said they were working on developing a model for Western North Carolina to repair major, multi-property landslides.

A disaster expert says there are sometimes warning signs of a landslide to look out for during heavy rain events.