Plutonium found in soil at the crippled Fukushima nuclear complex heightened alarm on Tuesday over Japan's protracted battle to contain the world's worst atomic crisis in 25 years.

In parliament, Japanese Prime Minister Naoto Kan was lambasted for his handling of the disaster, which was triggered by a massive earthquake and tsunami that slammed into the coastline north of Tokyo.

Already deeply unpopular, Kan assured angry lawmakers that that the government was making public all the information it had to hand and he apologized for flying over the stricken site one day after the quake, which media reports said had delayed crucial operations to cool the reactors.

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