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.
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Negotiators from London Underground and three unions are meeting at the Euston offices of the concilliation service ACAS.
Clear periods and light winds tonight. Staying warm and muggy. Lows of 17°C.