The electricity substation fire on 20 March caused chaos at Heathrow airport, which had to shut, affecting more than 200,000 passengers around the world. Europe's busiest airport had more than 1,000 flights cancelled on the Friday after the fire at the substation in Hayes, west London.
Transport for Wales said on social media, "Due to a train hitting an obstruction on the line between Hereford and Shrewsbury, all lines are blocked."
A large part of the South Terminal has been evacuated as a precaution while we continue to investigate a security incident. Passengers will not be able to enter the South Terminal while this is ongoing.
Met Office Chief Meteorologist, Steve Willington, warns of potential disruption due to Storm Ashley, emphasizing severe winds and rain expected across northern parts of the UK.