A man working on the Crossrail project is in hospital tonight with serious burns after an explosion, which is believed to have been caused by cutting through a cable.
It happened in Holborn at lunchtime and has caused traffic problems since. From there Julie Macdonald sent this report.
More top news
A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.