The Health and Safety Executive is investigating the explosion which happened on Pimlico Road in central London, yesterday morning.
"We are aware of this and we are making inquiries into what happened."
More top news
Police have launched a murder investigation after a 35-year-old man was stabbed to death in north London.
A man in his 40s was shot dead shortly before midnight by police in Enfield.
A round the world yacht race set off from London today on a year long journey which will see them circumnavigation the globe.