There is currently a major emergency service presence at St Helier Hospital in Carshalton.

A video of the chaos was taken by a passerby at around 1pm today (August 11).

The video displays multiple ambulances and fire engines at the scene, as well as dozens of people stood outside the hospital.

A spokesperson for the London Fire Brigade says the team responded to an automatic fire alarm at the hospital.

The fire brigade has confirmed it was not a gas leak.