In south London, a huge fire tore through a railway arch near Elephant and Castle station on Monday, sending a ball of flame and plumes of black smoke high into the sky.
The incident was not linked to terrorism, according to police. There were no immediate reports of injuries.
Ten fire engines and 70 firefighters tackled the blaze which swept through three commercial units, causing trains to be diverted.
The fire brigade advised people to stay away from the area and to keep their windows and doors closed during the road closures.
Video footage released by the fire brigade showed black smoke rising high into the sky and then a ball of fire erupting from the archway.