The attack saw a number of masked men storm Monak a pan-Asian sushi house which promises a “luxury dining experience” at 10.30pm on Friday.
They threatened staff with blades before using “gasoline” to torch the restaurant as terrified diners fled, according to My London.
A neighbour told the Standard: “There was a fire inside the restaurant. Then the fire engines turned up, they are still here.”
Footage posted to social media showed flames and smoke billowing out of the high-class eatery yards from the zebra crossing made famous by The Beatles.
The restaurant released a statement on Instagram promising to rebuild after the devastating fire.
They wrote: “We are devastated to announce that our restaurant has been affected by a fire. We are grateful for the efforts of the firefighters and the community for their support.
“We are working hard to get back on our feet and look forward to welcoming you back as soon as possible. In the meantime, thank you for continuing to support us and following our rebuilding journey.”
The statement added: “We wanted to take a moment to address our customers who were present during the fire.
“We are sorry that you had to witness this traumatic event, but we are grateful for your safety and cooperation during the evacuation.
“We are determined to rebuild our restaurant and continue to provide the food and experience that we know you love. Thank you for continuing to support us during this difficult time, and we look forward to welcoming you back soon.
“Thanks for our staff and security members who were present during the fire. Your professionalism and determination during this difficult situation were remarkable.
“We know that this has been a tough time for everyone, but your dedication to our business and community is truly appreciated. We look forward to working with you to rebuild our restaurant and continue to provide memorable experiences for our customers.
“Once again, thank you for your support and commitment.”
A Met spokesman confirmed there had been no arrests.
He added: “Police were called to reports that a number of males had entered a restaurant threatening staff with knives and starting a fire.
“The males made off prior to the arrival of police.
“The fire was extinguished and there were no reported injuries.
“An investigation is under way to identify and arrest those responsible, led by dedicated detectives from Central West CID.
“This will include analysis of all available CCTV among other lines of inquiry.”
Anyone with information is asked to call 101, ref 7931/18apr, or to remain anonymous contact Crimestoppers.