Twenty people are missing in central Japan after a huge landslide hit Atami city following heavy rainfall.

Video on social media showed a torrent of black mud plummeting down from a mountain top and on through the city towards the sea. Several houses were destroyed or buried.

Kyodo news agency reports that the bodies of what appear to be two victims have been found in the port district.

A witness described a "horrible sound" before he fled to higher ground.