Transport commentator Christian Wolmar on the day's HS2 announcements:
At this stage #hs2 estimate of £33bn can only be a guess as it was made before detailed work on routes. Off to BBC News Channel at 8 30
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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.