A Londoner has died during an expedition in the Arctic with two friends when the group got into trouble. They started their attempt to cross the Greenland ice cap on April 19 in a bid to raise more than £5,000 for the The Queen's Nursing Institute.
The two other British men are being treated in hospital.
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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.