Homes have been evacuated due to the "risk of toxic release or large cylinder explosion" at a large fire sweeping through an Ocado warehouse. A 500m "exclusion zone" has been set up as firefighters continue to tackle the blaze, which broke out on Tuesday morning. Deputy chief fire officer Andy Bowers said the evacuation of Walworth Industrial Estate in Hampshire was a precaution to "keep the public safe". A major incident has been declared. Live updates on the Ocado warehouse fire evacuations Mr Bowers said: "We have a risk of a toxic release or a large cylinder explosion. "We are working extremely closely with all of our partners to keep the public safe."