A search is underway for a construction worker who is believed to have fallen into a huge disused underground tank in the city of Yokohama, near Tokyo.

The man in his 60s went missing from a construction site in Yokohama's Kanazawa Ward on Tuesday evening. He was engaged in work to turn the site into a park. There is no sign of the earth-moving machinery he was operating at the time that weighs about 20 tons.