Michael Race
BBC South

Fire chiefs are hosting a meeting soon to establish how they will continue to tackle the blaze.

There is concern that a large cylinder containing refrigerant gas in it could explode.

A spokeswoman for the fire service told me the meeting was about how firefighters would control that situation.

Ocado said the fire, which started in a corner of the "ambient grid" where the robots operate, has caused substantial damage to the majority of the building and its contents. Part of the roof has also collapsed.

There has been no time given for when more information will be released, but Hampshire Fire and Rescue Service has said it will be giving updates on the blaze through the night on social media.

Fire crews also fear a "toxic release" from the huge blaze, leading to the evacuation of homes.

Hampshire Fire and Rescue have now released more details about the current exclusion zone.

The Press Association is reporting there is a "strong possibility" that those who work within the exclusion zone will not have access on Thursday morning.

Chief fire officer Neil Odin said: "It's a very difficult, deep-seating fire. It's made it very difficult for fire operations.

"It's an extensive fire and what that meant is there's a large cylinder with refrigerant gas in it, which is now being affected.

"We are hoping to get back on top of that shortly."

Lee Brinkworth, an electrician, told the BBC: "It looked like they had it under control and that's all really we saw throughout the day

"They seemed to cut open a section of roof and the smoke started billowing off to Picket Piece."

Offices and business nearby to the warehouse are beginning to make plans for tomorrow, with some saying they will remain closed.

Ocado have also said they are trying to fulfill as many orders as they can despite the fire in Andover.

A number of customers have asked about their orders on social media.

The firm has replied saying they are using "other fulfillment centres" to process deliveries and suggest customers check the website to see if their order has been picked.

Homes have been evacuated due to the "risk of toxic release or large cylinder explosion" at the warehouse.

The firm has posted an apology on social media to the Andover residents who have been evacuated from their homes.

Local MP Kit Malthouse has published an update on his Facebook page about the fire, asking residents to give the Fire service "space" to do their job.

The BBC's Ed Sault is at the scene in Andover. So far, 20 families have been moved to shelter.

There's a weather warning in place for much of England and Wales tonight for strong winds.

There's also rain predicted in Andover until the morning.

Residents near to the fire but outside the exclusion zone have been told to stay indoors and keep windows and doors shut.

Test Valley Borough Council has also said that if anyone needs to be evacuated, they will be told by members of the emergency services knocking on their door.

Crews from Fareham fire station have been helping to battle the blaze today in Andover.

They've just posted these images of the incident.

Members of the emergency services are visiting homes to give advice about what to do...