"The wi-fi has been hacked at 19 UK railway stations to display a message about terror attacks.
Network Rail confirmed that the wi-fi systems at stations including London Euston, Manchester Piccadilly, Liverpool Lime Street, Birmingham New Street, Edinburgh Waverley and Glasgow Central were affected.
People reported logging on to the wi-fi at the stations on Wednesday and being met with a screen about terror attacks in Europe.
A Network Rail spokesperson confirmed the wi-fi was still down and said: "We are currently dealing with a cyber-security incident affecting the public wi-fi at Network Rail’s managed stations."
The affected stations include:
In London, London Cannon Street, London Bridge, Charing Cross, Clapham Junction, Euston, King’s Cross, Liverpool Street, Paddington, Victoria and Waterloo
In the South East, Reading and Guildford
In the North West, Manchester Piccadilly and Liverpool Lime Street
In the West Midlands, Birmingham New Street
In West Yorkshire, Leeds
In the West and South West, Bristol Temple Meads
In Scotland, Edinburgh Waverley and Glasgow Central
British Transport Police was investigating, Network Rail said.
The rail provider said it believed other organisations, not just railway stations, had also been affected..."