Thousands of travellers faced severe delays and cancellations earlier after a man spent the night on the roof of London's St Pancras Station.

British Transport Police arrested a 44-year-old man this morning after he made his way onto the overhead viaduct of the station, causing Eurostar and Southeastern trains to be cancelled.

The lines underneath the viaduct had to be turned off meaning no trains to or from the station could depart to protect the trespasser's safety.

Dozens of passengers were stranded at St Pancras on Saturday morning as operators try to resume services.

Services on the Eurostar and Southeastern High Speed returned to normal around midday.

Images circulating on social media show a person on the viaduct draped in a St George's Cross flag.

He is thought to have been on top of the tracks since around 7pm on Friday evening, according to the British Transport Police.