Japan’s top nuclear regulator has raised safety concerns about hastily built storage tanks and their foundations after signs of more leaks of radiation-contaminated water at the Fukushima Dai-Ichi nuclear power plant.

Japan’s top nuclear regulator has raised safety concerns about hastily built storage tanks and their foundations amid reports of new leaks of radiation-contaminated water at a tsunami-hit nuclear plant.

A leak of highly radioactive water at the crippled Fukushima nuclear power plant could be the beginning of a new disaster, Japan’s nuclear watchdog said.

Japan’s nuclear watchdog is proposing raising the risk level of the leakage of highly radioactive water at the crippled Fukushima nuclear power plant from “an anomaly” to a “serious incident.”

Japan has launched a new nuclear oversight agency following criticism that collusion between regulators and plant operators contributed to meltdowns at the tsunami-stricken Fukushima Dai-Ichi plant.