All services from Swiss Cottage station were halted after an emergency alert sounded and one passanger reported the “smell of smoke”.
The disruption has caused severe delays on the Jubilee line and Justin Bieber fans are worried they will miss seeing the superstar in concert at the O2 Arena.
One upset teen tweeted: “Jubilee Line broke down, my world just ended”.
Another fan was close to tears tweeting: “Honestly if I miss any of Justin I”ll cry. Please.”
According to the Underground line”s Twitter page, trains have been suspended between Waterloo and Finchley Road as emergency services investigate.
London Fire Brigade have sent crews.
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