The three people arrested in connection with the Boston Marathon bombings have been under FBI surveillance for around 10 days and are likely to have taken items out of Dzohkhar Tsarnaev's dormitory, according to NBC.
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Find out what to expect from the weather if you are running in the big race in London or watching from the sidelines.
It will be a soggy start to the weekend and temperatures will drop making it feel colder than in recent days.
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