King’s Cross St Pancras station is closed after ‘flare set off in underground’ sparking mass evacuation of passengers

Police say a flare was set off in the underground station

A MAJOR London train station has been closed due to a fire alert.

Several fire engines are currently outside King's Cross station in north London.

Witnesses have reported "a strong smell of gas and smoke" from outside the busy international travel hub.

The underground station has also been closed.

A police officer at the scene told The Sun: “Someone has set off a flare in the underground and we’ve had to shut down the area.

"Firefighters are down there now.

"We don’t know when we’ll open the underground again."

A TFL spokesperson said: "King's Cross St. Pancras station is closed while we respond to a fire alert."