Hundreds of Japanese demonstrators have been marching to celebrate the last of the country's 54 nuclear reactors being switched off.

The crowd gathered at a Tokyo park on Saturday said that they were not concerned about government warnings that the reactor shutdowns will lead to electricity shortages.

One of three reactors at the Tomari nuclear plant, on the northern island of Hokkaido, has gone offline for routine maintenance checks, meaning that for the first time in decades there is not a single active nuclear reactor in the country.