The Fire Brigade has told Londoners not to panic after a pavement burst into flames on a busy shopping street. Around 50 people were evacuated from the Caledonian Road area in Islington when it happened. Last year Health and Safety Officials warned that Londoners could be at serious risk after two other similar explosions.
UK Power Networks, which is responsible for the power cables in the street, said it regularly inspects the network, and underground equipment can always develop a fault, but most of the time it has no external impact:
Here's our Senior Correspondent Ronke Phillips.