Officers have until Thursday evening to question the man from West Derby.
He is in custody on suspicion of attempted murder, dangerous driving and drug driving.
Police believe the car which struck pedestrians was able to follow an ambulance crew attending to someone suffering a heart attack after a road block was temporarily lifted.
Hundreds of thousands of Liverpool fans had turned out to celebrate their team’s Premier League title when the incident unfolded on Water Street just after 6pm on Monday.
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‘My boy in his pram, got bounced’
‘The best day of my life turned into worst’
Sky News interviewed a lifelong Liverpool fan who said his five-month-old son was “bounced” 15ft (4.6m) in his pram after they were hit by the vehicle.
The child was not counted in the police’s injury tally.
Daniel Eveson, 36, also said his partner had been driven over.
“The best day of my life turned into [the] worst,” Mr Eveson said.
He added: “Me and my partner were flat on the roof, on the bonnet… we were just both trying to hold on for dear life with Ted next to us.
“And my partner went under the wheels of the car, of the front of the car, and it rolled over her leg, and I just bounced off to the side, but my boy and his pram got bounced totally in the opposite direction – about 15ft down the road.”
Prime Minister Sir Keir Starmer travelled to Liverpool to meet with police chiefs and the local metro mayor.
He said he was being kept informed of developments, adding: “The scenes on Monday were just awful, to see how incredible joy at an amazing achievement turned to horror in a moment.”
Messages of support have been sent to the people of Liverpool, including from the King who said: “I know that the strength of community spirit for which your city is renowned will be a comfort and support to those in need.”
Tasers can be used in prisons for the first time to tackle “unacceptably high” levels of violence, as part of a new trial.
Justice Secretary Shabana Mahmood has said she is “determined to keep prison staff safe”.
Specialist officers from two bases in Oxfordshire and Doncaster can now be deployed to incidents in adult male prisons in England and Wales, equipped with Tasers.
Image: In a demonstration hostage situation, officers used pyrotechnics to distract an aggressive inmate
Image: Officers tackled an aggressive ‘inmate’ after he was distracted by pyrotechnics in the demonstration
Reporters attending a demonstration were shown how they could be used in certain scenarios, where there is a threat to safety, including hostage situations or riots, and where multiple people are involved in “mass disorder”.
One demonstration involved four prisoners who had become disruptive in the exercise yard.
After staff were forced to withdraw, three inmates turned on one and it was deemed there was an “immediate threat to life.”
Officers gave verbal warnings before deploying the Tasers at a distance.
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This trial will use the Taser 7 model, which is what police officers currently use.
It can generate 50,000 volts when triggered, but drops to about 1,500 volts when hitting the target.
In a separate hostage situation, officers used pyrotechnics which produced loud bangs and smoke to distract an aggressive “inmate” before putting them in handcuffs.
Image: An ‘inmate’ is tackled by a security officer during a simulation
At first, specialist national officers from the two bases can be deployed if such incidents occur.
It’s understood at the moment these teams get 800 callouts a year – averaging just over two a day.
The trial will run until enough data is collected to determine whether Tasers should be rolled out more widely.
Ms Mahmood said she intends to have further updates in the autumn and will “consider” whether local staff inside jails can use them.
“From my perspective, this is very much the beginning,” she said.
Violence in prisons has been rising. In the 12 months to December there were 10,605 assaults on staff, a rise of 13% on the year before and a new peak. Serious assaults were also up 10% on the previous 12 months.
Image: A security officer demonstrates the Taser in use
Earlier this year, Manchester Arena bomb plotter Hashem Abedi attacked prison staff at the high-security jail HMP Frankland, using hot cooking oil and homemade, or improvised, weapons.
The justice secretary said the incident at Frankland “forced the pace” of further measures to tackle violence.
Southport killer Axel Rudakubana also allegedly attacked a member of staff at HMP Belmarsh by pouring hot water over them from inside his cell.
The Prison Officers Association (POA) union urged ministers to consider protective equipment and stab vests for staff.
Last month, the government announced the use of body armour at certain units in high-security jails, which house some of the most dangerous inmates.
But while “grateful” for a “step in the right direction”, the POA don’t think the new measure goes far enough – and instead want specialist staff inside jails trained to use Tasers.
“It is pointless a national response being several hours away if, locally, Taser is needed to immediately preserve life and combat threat,” Mark Fairhurst, the POA’s national chairman said.
Whitehall wants to consider the “lessons” from this trial before any potential further rollout.
Ms Mahmood pointed out that while Tasers have been used for many years by the police, “a custodial setting is different to usage in other scenarios”.
Paul Gallagher, the older brother of Oasis stars Noel and Liam, has been charged with multiple offences including rape.
The Metropolitan Police said Gallagher, 59, of East Finchley, north London, has been charged with rape, coercive and controlling behaviour, three counts of sexual assault, three counts of intentional strangulation, two counts of making a threat to kill and assault occasioning actual bodily harm.
The offences are reported to have taken place between 2022 and 2024. The charges follow an investigation which began last year, the force added in a statement.
A woman is being supported by specially-trained officers, the statement continued.
Paul Gallagher, who is about one year older than Noel and seven years older than Liam, has never been involved in Oasis.
He is due to appear at Westminster Magistrates’ Court on 27 August.