CNN Correspondent Deborah Feyerick and Fox News' Sharman Sacchetti have tweeted:
#Tsarnaev trial is likely to take 3-4 months. His demeanor is almost nonchalant. He turns away from the judge to look at his relatives.
Trial expected to last three to four months, 80-100 witnesses
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Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.
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A Met Office warning covering much of England and south-east Wales is expected to remain in place until 11am.