Crews from Merseyside Fire and Rescue Service were in attendance within four minutes of yesterday's incident on Water Street.
That's according to Nick Searle, Chief Merseyside Fire Officer, who spoke at last night's press conference.
He said: "We immediately mobilised three fire engines to Water Street and were in attendance in four minutes.
"On arrival, the crews were met with numerous injured people and four persons trapped under a vehicle.
"Our crews rapidly lifted the vehicle, removed three adults and one child from beneath and passed them to our ambulance service colleagues.
"We then worked with emergency service partners to ensure casualties received medical treatment and transport to hospital as quickly as possible.
"My fire crews will maintain a visible and reassuring presence in the coming days and weeks."