The fire tore through the multi-storey King's Dock vehicle park on new year's eve, when the 11,000-capacity arena was hosting the fourth day of the Liverpool International Horse Show.
The fire, which was hot enough to melt aluminium, engulfed seven floors of the multi-storey auto park on the city's waterfront.
The evening performance of the Liverpool International Horse Show that was scheduled to take place at the Echo Arena was cancelled as a result of the fire.
The fire service said that no one had been seriously injured in the fire, but confirmed it did rescue six dogs from various cars on the site.
An insurance trade body says some £20 million could be paid out to victims of a Liverpool auto park inferno that incinerated some 1,600 vehicles.
Calling 101 or 999 with vehicle-related queries will be referred to the owner's insurance company and will not be dealt with by Merseyside Fire & Rescue Service and Merseyside Police.
"Initial investigations indicate that an accidental fire within a vehicle caused other cars to ignite", the force said.
"The flames and the smoke was unbelievable", said Kevin Booth, 44, who was heading to the horse show with his family. The blaze started Sunday afternoon.
A reception centre was set up for people unable to get home due to the fire and locals volunteered to take in or transport those left stranded.
Bob Prattey, chief executive of The ACC Liverpool Group, said: "We can confirm that our future events will be able to proceed as planned following the serious fire which was contained in the Liverpool Waterfront Car Park on New Year's Eve".
Sue, who helped raise the alarm to ensure horses could be safely evacuated, told the BBC: "It looked like a ball of fire on the front of the auto and it was producing a lot of smoke".
This morning, a Merseyside Police spokesperson said: "Emergency services are still dealing with the incident at the Echo Arena".
"If you see smoke from the Liverpool Echo Arena auto park fire then stay indoors, close all your windows and doors and if you have difficulty breathing seek medical assistance".
She said the fire was "ferocious and spreading".
Merseyside Fire and Rescue Service/PA Temperates reached 1,000C during the blaze.