The Japanese nuclear watchdog proposed raising the rating of a leakage of highly radioactive water at the crippled Fukushima nuclear power plant from "an anomaly" to a "serious incident."
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Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.
Windy this weekend with gales across northwestern parts of the UK. Rain spreading southeast.
Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."