Euston station was evacuated this morning after a fire alert which has led to severe delays on the Northern Line.
The station was closed shortly after 9am due to the alert, prompted from smoke coming from underneath a train.
There are now severe delays between Camden Town and Kennington.
London Fire Brigade was called to the scene at 9.09am and was investigating the alert.
It later said a fire had not been found.
A London Fire Brigade statement said: "We have finished our investigations at Euston underground station. There was slight smoke coming from underneath a train but no fire was identified. Crews will be leaving the scene shortly."
