A powerful typhoon approaching southwestern Japan has intensified into a dangerous storm, with officials warning of record rainfall, huge waves and high tides.

The approach of Typhoon Haishen comes after Typhoon Maysak left at least 20 injured in Kyushu before making landfall on the Korean Peninsula.

That storm caused widespread blackouts in Kyushu and led to the suspension of some bullet trains and flights in the region. In South Korea, the storm killed at least two people and caused widespread power outages, reports said.