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Japan has raised the alert level at a stricken nuclear plant from four to five on a seven-point international scale for atomic incidents.
The crisis at the Fukushima Daiichi site is now two levels below Ukraine's 1986 Chernobyl disaster.
The head of the UN's nuclear watchdog warned in Tokyo the battle to stabilise the plant was a race against time.
The crisis at the Fukushima Daiichi site is now two levels below Ukraine's 1986 Chernobyl disaster.
The head of the UN's nuclear watchdog warned in Tokyo the battle to stabilise the plant was a race against time.
