Emergency vehicles responded heavily to a "chemical incident" on Wimbledon Hill Road in south London today (April 10).

London Fire Brigade tweeted: "Firefighters have attended reports of a smell of chemicals at a bank and offices in Wimbledon, [where] four people were taken to hospital.

"The cause of the incident is believed to be fumigation of the building which had taken place overnight."

The filmer explained to Newsflare: "I was travelling to Wimbledon station when I noticed over a dozen parked emergency vehicles.

"I started taking pictures and videos and speaking to emergency workers on the scene.

"One suggested there had been a minor chemical incident and that it was to do with some pest control measures performed the night before."

I was travelling to Wimbledon station when I noticed over a dozen parked emergency vehicles. I started taking pictures and videos and speaking to emergency workers on the scene. One suggested there had been a minor chemical incident and that it was to do with some pest control measures performed the night before. This was later officially confirmed by the London Fire Brigade: https://twitter.com/londonfire/status/1115981087728123905?s=21