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The fire broke out at a construction site in Islington, London Fire Brigade confirmed.

At least six engines were sent to the scene in Balfe Street.

Pictures posted on social media showed thick smoke billowing over the busy King's Cross railway station.

(Image: TWITTER)

(Image: TWITTER)

(Image: TWITTER)

Nearby offices were been evacuated as emergency workers made the scene safe.

The Met Police at Camden tweeted: "Officers are currently dealing with a large fire in the Kings cross area".

The sight of emergency workers in the area immediately sparked panic that something more "sinister" had occurred.

One person tweeted: "Something happening at Kings Cross station? Lots of sirens and saw black smoke earlier too from Euston".

Another person asked: "Kings Cross Station???? What's happening?"

The London Brigade later commented: "The fire at a building site in #Islington is now under control.

"Crews remain at the scene damping down."