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A huge fire that broke out at an Ocado robotic warehouse in Hampshire more than 24 hours ago has been declared a major incident as it continues to burn.

Around 200 firefighters have been tackling the blaze which began at the Andover facility at around 2.44am on Tuesday morning.

Hampshire Fire and Rescue Service (HFRS) said four of its firefighters had been treated for slight smoke inhalation as they battled to bring the fire under control.

Locals have been urged to keep their windows and doors shut due to the smoke belching from the inferno, while the public was also asked to avoid the area.

(Image: UKNIP (UK News in Pictures)) (Image: UKNIP (UK News in Pictures))

Witnesses said the "noise, heat, smell and light pouring from the Ocado warehouse is frighteningly real".

"The blaze that is sweeping through the Ocado warehouse in Andover has been declared a major incident," HFRS said.

"About 200 firefighters have been tackling the fire which broke out at 2.44am on February 5.

(Image: UKNIP (UK News in Pictures)) (Image: UKNIP (UK News in Pictures))

"Four firefighters have been treated for slight smoke inhalation.

"Part of the roof has now collapsed and the fire in the complex robot-run distribution centre is still ongoing."

One local tweeted: "Just streets away - the noise, heat, smell and light pouring from the Ocado warehouse is frighteningly real.

(Image: UKNIP (UK News in Pictures))

"120+ firefighters are risking their lives tackling the blaze. Makes you truly appreciate the brave men and women of the Fire Service!! Thank you. Stay safe"

Ocado said that it had to cancel some customer orders because of the fire and it was "working hard to resume normal service as soon as possible".