David Cameron has started a special fundraising effort by the Royal Marines ahead of Remembrance Sunday. The Marines are attempting to break a world record for the fastest speed march. A team will head west and attempt to run a 26.5 mile course in under 4 hours and 19 minutes.
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Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.
At least five people have suffered minor injuries but the cause of the blast is still unknown.