A first International Congress of the Japan's Congress Against Atomic and Hydrogen Bombs was first held in the city Fukushima, urging also an end to nuclear energy.
A 9.0-magnitude quake off Japan's northeast coast on March 11 triggered a tsunami and explosions at the Fukushima nuclear power plant (NPP), which caused the worst nuclear crisis since Chernobyl in 1986. Radioactive elements were later found in the water, air and food products in some parts of Japan.
"We should shout 'No more Fukushima,'" Koichi Kawano, who heads the congress, said. "We have tended to focus on abolition of nuclear weapons while being weak in our campaign against nuclear power plants," he continued.
The Japanese authorities said earlier in July that it would take decades to decommission the crippled NPP, while environment experts reported higher concentration of radioactive elements in soil and produce from the region.
About 15,000 people took to the streets in Tokyo in early April to protest against the nuclear power industry after a devastating earthquake caused meltdown at the Fukushima nuclear plant.
Powerful aftershocks continue to rattle Japan, fueling fears of another natural disaster that could hit the country anytime.