Ocado shares have dropped 6% and the retailer has warned over a hit to sales following a huge fire which swept through its warehouse in Hampshire.
About 200 firefighters spent the night tackling the blaze, which broke out on Tuesday morning.
The online grocer said it expected a fall in sales growth until it could shift operations to other warehouses.
More than 30,000 orders are processed by robots at the Andover warehouse each week.
Ocado has not given any detail about what the impact will be to customers.
Many customers have contacted Ocado on Twitter to ask about cancelled deliveries, while others have expressed sympathy for the online supermarket.
Operations at the site remain suspended.
We’ll be looking to fulfil orders placed throughout the week with measures put in place, if you’d like us to check yours at all, please do feel free to DM us with your email and postcode as we can check on the status for you. – Christian
— Ocado (@Ocado) February 6, 2019
End of Twitter post by @Ocado
One thing a company can’t determine is unforeseen circumstances. The amount of abuse @Ocado can take because people can’t have a delivery delivered is ridiculous. Surely people have some sort of compassion and think of the affect a fire has on a company and all its staff?
— Mummy To The Max (@MummyToTheMax) February 5, 2019
End of Twitter post by @MummyToTheMax
Ocado has other warehouses, including in Hatfield, Hertfordshire, which have been unaffected.
The site, on the Walworth Industrial Estate, accounts for 10% of Ocado’s capacity.
Ocado said it had comprehensive insurance for the property, stock and equipment and for business interruption losses.
“Once we have had time to assess the damage and prepare a plan to return the CFC (customer fulfilment centre) to operation we will update further as appropriate,” a spokesman said.
Hampshire Fire and Rescue Service said about 70 firefighters remain at the site and urged nearby residents to keep doors and windows shut.
Four firefighters have been treated for minor smoke inhalation.
No Ocado staff were injured.
On Tuesday Ocado said it had cancelled some customer orders because of the fire and it was “working hard to resume normal service as soon as possible”.
The blaze came on the same day it reported widening losses.
The company recorded a pre-tax loss of £44.4m for the year ending 2 December 2018, compared with £9.8m in the previous 12 months.