At least 38 people across 14 states have died from a powerful winter storm that left much of the central and eastern US gripped by snow and ice.

Top immigration officials in the US have repeatedly made statements after violent encounters involving federal agents - including two recent fatal shootings - later contradicted by evidence, Reuters reports.

Police say they didn't tend the Mt Maunganui campground after receiving a call about a disorder incident referencing a potential landslip hours before a deadly landslide.